Leetcode Questions Ranking List

According to this list, we can see which questions are popular.
Whether you are a student or an interviewer, you can refer to this list when choosing questions.

Ranking by Net Profit (Likes - Dislikes).
Grouping by topic.
No payment questions.
Generated by: LeetCode Questions Spiderman
Generated time: 2019-09-11 14:42:11

Array

ID	Title	Net Profit	Likes	Dislikes	Difficulty
1	Two Sum	11394	11800	406	Easy
53	Maximum Subarray	4841	5029	188	Easy
4	Median of Two Sorted Arrays	4238	4950	712	Hard
42	Trapping Rain Water	4233	4313	80	Hard
15	3Sum	3951	4458	507	Medium
11	Container With Most Water	3419	3889	470	Medium
121	Best Time to Buy and Sell Stock	2942	3081	139	Easy
33	Search in Rotated Sorted Array	2541	2898	357	Medium
287	Find the Duplicate Number	2537	2862	325	Medium
238	Product of Array Except Self	2475	2711	236	Medium
152	Maximum Product Subarray	2363	2478	115	Medium
560	Subarray Sum Equals K	2332	2399	67	Medium
39	Combination Sum	2322	2396	74	Medium
56	Merge Intervals	2294	2487	193	Medium
283	Move Zeroes	2256	2340	84	Easy
78	Subsets	2238	2294	56	Medium
84	Largest Rectangle in Histogram	2200	2260	60	Hard
55	Jump Game	2130	2357	227	Medium
79	Word Search	2053	2162	109	Medium
128	Longest Consecutive Sequence	2027	2138	111	Hard
105	Construct Binary Tree from Preorder and Inorder Traversal	1992	2048	56	Medium
34	Find First and Last Position of Element in Sorted Array	1824	1921	97	Medium
169	Majority Element	1776	1944	168	Easy
75	Sort Colors	1772	1942	170	Medium
62	Unique Paths	1737	1865	128	Medium
48	Rotate Image	1698	1868	170	Medium
448	Find All Numbers Disappeared in an Array	1677	1848	171	Easy
85	Maximal Rectangle	1637	1691	54	Hard
581	Shortest Unsorted Continuous Subarray	1585	1659	74	Easy
64	Minimum Path Sum	1571	1614	43	Medium
621	Task Scheduler	1564	1906	342	Medium
31	Next Permutation	1460	2152	692	Medium
41	First Missing Positive	1388	2027	639	Hard
45	Jump Game II	1344	1427	83	Hard
35	Search Insert Position	1322	1522	200	Easy
123	Best Time to Buy and Sell Stock III	1260	1317	57	Hard
209	Minimum Size Subarray Sum	1245	1324	79	Medium
380	Insert Delete GetRandom O(1)	1229	1325	96	Medium
16	3Sum Closest	1220	1316	96	Medium
695	Max Area of Island	1179	1243	64	Medium
120	Triangle	1153	1303	150	Medium
442	Find All Duplicates in an Array	1148	1268	120	Medium
73	Set Matrix Zeroes	1042	1264	222	Medium
153	Find Minimum in Rotated Sorted Array	1016	1195	179	Medium
90	Subsets II	1004	1055	51	Medium
40	Combination Sum II	998	1048	50	Medium
18	4Sum	993	1242	249	Medium
106	Construct Binary Tree from Inorder and Postorder Traversal	991	1012	21	Medium
714	Best Time to Buy and Sell Stock with Transaction Fee	991	1024	33	Medium
126	Word Ladder II	945	1147	202	Hard
189	Rotate Array	941	1592	651	Easy
746	Min Cost Climbing Stairs	938	1223	285	Easy
665	Non-decreasing Array	936	1210	274	Easy
289	Game of Life	897	1099	202	Medium
229	Majority Element II	892	1011	119	Medium
54	Spiral Matrix	889	1338	449	Medium
74	Search a 2D Matrix	884	1002	118	Medium
57	Insert Interval	854	982	128	Hard
63	Unique Paths II	827	992	165	Medium
118	Pascal's Triangle	754	838	84	Easy
718	Maximum Length of Repeated Subarray	723	755	32	Medium
713	Subarray Product Less Than K	704	739	35	Medium
216	Combination Sum III	657	694	37	Medium
167	Two Sum II - Input array is sorted	630	1066	436	Easy
766	Toeplitz Matrix	621	689	68	Easy
611	Valid Triangle Number	607	687	80	Medium
689	Maximum Sum of 3 Non-Overlapping Subarrays	604	637	33	Hard
907	Sum of Subarray Minimums	594	638	44	Medium
719	Find K-th Smallest Pair Distance	591	612	21	Hard
670	Maximum Swap	589	637	48	Medium
565	Array Nesting	544	627	83	Medium
724	Find Pivot Index	533	703	170	Easy
566	Reshape the Matrix	528	618	90	Easy
792	Number of Matching Subsequences	502	545	43	Medium
905	Sort Array By Parity	496	556	60	Easy
628	Maximum Product of Three Numbers	483	766	283	Easy
832	Flipping an Image	465	590	125	Easy
59	Spiral Matrix II	458	544	86	Medium
381	Insert Delete GetRandom O(1) - Duplicates allowed	438	488	50	Hard
81	Search in Rotated Sorted Array II	435	784	349	Medium
873	Length of Longest Fibonacci Subsequence	427	446	19	Medium
769	Max Chunks To Make Sorted	426	514	88	Medium
977	Squares of a Sorted Array	426	477	51	Easy
643	Maximum Average Subarray I	415	503	88	Easy
849	Maximize Distance to Closest Person	409	487	78	Easy
729	My Calendar I	394	421	27	Medium
674	Longest Continuous Increasing Subsequence	392	493	101	Easy
1011	Capacity To Ship Packages Within D Days	391	403	12	Medium
154	Find Minimum in Rotated Sorted Array II	385	541	156	Hard
974	Subarray Sums Divisible by K	372	406	34	Medium
918	Maximum Sum Circular Subarray	365	386	21	Medium
119	Pascal's Triangle II	364	542	178	Easy
926	Flip String to Monotone Increasing	352	365	13	Medium
1002	Find Common Characters	352	404	52	Easy
950	Reveal Cards In Increasing Order	348	433	85	Medium
795	Number of Subarrays with Bounded Maximum	347	384	37	Medium
922	Sort Array By Parity II	313	347	34	Easy
896	Monotonic Array	312	339	27	Easy
962	Maximum Width Ramp	312	322	10	Medium
768	Max Chunks To Make Sorted II	274	284	10	Hard
870	Advantage Shuffle	272	293	21	Medium
888	Fair Candy Swap	257	345	88	Easy
605	Can Place Flowers	255	541	286	Easy
1014	Best Sightseeing Pair	238	250	12	Medium
1035	Uncrossed Lines	228	235	7	Medium
1010	Pairs of Songs With Total Durations Divisible by 60	219	237	18	Easy
1031	Maximum Sum of Two Non-Overlapping Subarrays	216	227	11	Medium
915	Partition Array into Disjoint Intervals	214	231	17	Medium
914	X of a Kind in a Deck of Cards	204	270	66	Easy
945	Minimum Increment to Make Array Unique	197	206	9	Medium
1122	Relative Sort Array	184	200	16	Easy
1109	Corporate Flight Bookings	176	205	29	Medium
80	Remove Duplicates from Sorted Array II	175	753	578	Medium
830	Positions of Large Groups	169	234	65	Easy
941	Valid Mountain Array	148	198	50	Easy
1013	Partition Array Into Three Parts With Equal Sum	146	178	32	Easy
1074	Number of Submatrices That Sum to Target	135	140	5	Hard
989	Add to Array-Form of Integer	131	163	32	Easy
1052	Grumpy Bookstore Owner	120	133	13	Medium
954	Array of Doubled Pairs	114	137	23	Medium
509	Fibonacci Number	112	270	158	Easy
775	Global and Local Inversions	105	228	123	Medium
985	Sum of Even Numbers After Queries	101	189	88	Easy
1146	Snapshot Array	92	116	24	Medium
900	RLE Iterator	86	147	61	Medium
485	Max Consecutive Ones	78	405	327	Easy
978	Longest Turbulent Subarray	76	125	49	Medium
1157	Online Majority Element In Subarray	72	86	14	Hard
697	Degree of an Array	60	570	510	Easy
891	Sum of Subsequence Widths	59	140	81	Hard
1160	Find Words That Can Be Formed by Characters	55	72	17	Easy
1018	Binary Prefix Divisible By 5	39	101	62	Easy
1089	Duplicate Zeros	38	141	103	Easy
1128	Number of Equivalent Domino Pairs	30	75	45	Easy
1007	Minimum Domino Rotations For Equal Row	26	104	78	Medium
1184	Distance Between Bus Stops	22	28	6	Easy
228	Summary Ranges	6	419	413	Medium
1177	Can Make Palindrome from Substring	5	74	69	Medium
867	Transpose Matrix	-6	236	242	Easy
782	Transform to Chessboard	-9	91	100	Hard
1040	Moving Stones Until Consecutive II	-19	79	98	Medium
1144	Decrease Elements To Make Array Zigzag	-19	44	63	Medium
1170	Compare Strings by Frequency of the Smallest Character	-32	36	68	Easy
969	Pancake Sorting	-38	179	217	Medium
835	Image Overlap	-80	213	293	Medium
1053	Previous Permutation With One Swap	-96	54	150	Medium
217	Contains Duplicate	-100	466	566	Easy
219	Contains Duplicate II	-131	569	700	Easy
999	Available Captures for Rook	-153	109	262	Easy
1185	Day of the Week	-159	14	173	Easy
122	Best Time to Buy and Sell Stock II	-178	1227	1405	Easy
825	Friends Of Appropriate Ages	-222	190	412	Medium
747	Largest Number At Least Twice of Others	-225	222	447	Easy
1169	Invalid Transactions	-228	21	249	Medium
667	Beautiful Arrangement II	-296	248	544	Medium
495	Teemo Attacking	-299	264	563	Medium
414	Third Maximum Number	-364	423	787	Easy
268	Missing Number	-392	1086	1478	Easy
717	1-bit and 2-bit Characters	-443	284	727	Easy
162	Find Peak Element	-503	994	1497	Medium
532	K-diff Pairs in an Array	-507	393	900	Easy
1051	Height Checker	-526	75	601	Easy
840	Magic Squares In Grid	-666	86	752	Easy
661	Image Smoother	-676	192	868	Easy
66	Plus One	-758	977	1735	Easy
457	Circular Array Loop	-818	182	1000	Medium
27	Remove Element	-1064	948	2012	Easy
561	Array Partition I	-1275	615	1890	Easy
88	Merge Sorted Array	-1765	1281	3046	Easy
26	Remove Duplicates from Sorted Array	-1965	1718	3683	Easy

Dynamic Programming

ID	Title	Net Profit	Likes	Dislikes	Difficulty
53	Maximum Subarray	4841	5029	188	Easy
5	Longest Palindromic Substring	3885	4281	396	Medium
121	Best Time to Buy and Sell Stock	2942	3081	139	Easy
198	House Robber	2882	2975	93	Easy
300	Longest Increasing Subsequence	2863	2932	69	Medium
70	Climbing Stairs	2516	2609	93	Easy
139	Word Break	2501	2640	139	Medium
10	Regular Expression Matching	2450	3016	566	Hard
72	Edit Distance	2404	2441	37	Hard
152	Maximum Product Subarray	2363	2478	115	Medium
32	Longest Valid Parentheses	2131	2232	101	Hard
322	Coin Change	2099	2181	82	Medium
96	Unique Binary Search Trees	1941	2018	77	Medium
62	Unique Paths	1737	1865	128	Medium
85	Maximal Rectangle	1637	1691	54	Hard
64	Minimum Path Sum	1571	1614	43	Medium
279	Perfect Squares	1554	1696	142	Medium
647	Palindromic Substrings	1533	1615	82	Medium
494	Target Sum	1522	1596	74	Medium
221	Maximal Square	1512	1548	36	Medium
309	Best Time to Buy and Sell Stock with Cooldown	1498	1557	59	Medium
312	Burst Balloons	1494	1541	47	Hard
338	Counting Bits	1492	1608	116	Medium
416	Partition Equal Subset Sum	1406	1446	40	Medium
95	Unique Binary Search Trees II	1327	1450	123	Medium
123	Best Time to Buy and Sell Stock III	1260	1317	57	Hard
44	Wildcard Matching	1182	1260	78	Hard
120	Triangle	1153	1303	150	Medium
486	Predict the Winner	1023	1095	72	Medium
264	Ugly Number II	1009	1080	71	Medium
213	House Robber II	1005	1040	35	Medium
714	Best Time to Buy and Sell Stock with Transaction Fee	991	1024	33	Medium
516	Longest Palindromic Subsequence	942	1082	140	Medium
746	Min Cost Climbing Stairs	938	1223	285	Easy
698	Partition to K Equal Sum Subsets	923	980	57	Medium
410	Split Array Largest Sum	901	954	53	Hard
140	Word Break II	887	1153	266	Hard
787	Cheapest Flights Within K Stops	883	917	34	Medium
97	Interleaving String	858	908	50	Hard
673	Number of Longest Increasing Subsequence	837	900	63	Medium
188	Best Time to Buy and Sell Stock IV	833	890	57	Hard
63	Unique Paths II	827	992	165	Medium
377	Combination Sum IV	799	904	105	Medium
174	Dungeon Game	785	804	19	Hard
115	Distinct Subsequences	746	785	39	Hard
718	Maximum Length of Repeated Subarray	723	755	32	Medium
650	2 Keys Keyboard	691	740	49	Medium
132	Palindrome Partitioning II	666	690	24	Hard
354	Russian Doll Envelopes	629	658	29	Hard
983	Minimum Cost For Tickets	625	639	14	Medium
689	Maximum Sum of 3 Non-Overlapping Subarrays	604	637	33	Hard
740	Delete and Earn	599	656	57	Medium
712	Minimum ASCII Delete Sum for Two Strings	588	626	38	Medium
368	Largest Divisible Subset	584	616	32	Medium
813	Largest Sum of Averages	584	606	22	Medium
646	Maximum Length of Pair Chain	562	618	56	Medium
376	Wiggle Subsequence	561	612	51	Medium
464	Can I Win	561	686	125	Medium
801	Minimum Swaps To Make Sequences Increasing	539	574	35	Medium
413	Arithmetic Slices	528	661	133	Medium
392	Is Subsequence	523	665	142	Easy
403	Frog Jump	515	586	71	Hard
474	Ones and Zeroes	479	633	154	Medium
343	Integer Break	474	658	184	Medium
741	Cherry Pickup	467	506	39	Hard
363	Max Sum of Rectangle No Larger Than K	434	470	36	Hard
873	Length of Longest Fibonacci Subsequence	427	446	19	Medium
304	Range Sum Query 2D - Immutable	407	547	140	Medium
871	Minimum Number of Refueling Stops	392	400	8	Hard
887	Super Egg Drop	392	438	46	Hard
546	Remove Boxes	374	413	39	Hard
688	Knight Probability in Chessboard	362	456	94	Medium
467	Unique Substrings in Wraparound String	342	409	67	Medium
968	Binary Tree Cameras	328	339	11	Hard
847	Shortest Path Visiting All Nodes	311	349	38	Hard
838	Push Dominoes	303	342	39	Medium
730	Count Different Palindromic Subsequences	302	338	36	Hard
514	Freedom Trail	292	310	18	Hard
975	Odd Even Jump	290	410	120	Hard
931	Minimum Falling Path Sum	289	326	37	Medium
321	Create Maximum Number	284	449	165	Hard
818	Race Car	284	321	37	Hard
552	Student Attendance Record II	261	323	62	Hard
446	Arithmetic Slices II - Subsequence	258	302	44	Hard
664	Strange Printer	252	289	37	Hard
691	Stickers to Spell Word	249	275	26	Hard
472	Concatenated Words	241	313	72	Hard
1000	Minimum Cost to Merge Stones	237	258	21	Hard
1027	Longest Arithmetic Sequence	236	253	17	Medium
764	Largest Plus Sign	231	299	68	Medium
898	Bitwise ORs of Subarrays	231	294	63	Medium
576	Out of Boundary Paths	215	328	113	Medium
940	Distinct Subsequences II	212	222	10	Hard
1105	Filling Bookcase Shelves	206	217	11	Medium
920	Number of Music Playlists	203	234	31	Hard
1049	Last Stone Weight II	198	206	8	Medium
956	Tallest Billboard	193	203	10	Hard
935	Knight Dialer	190	287	97	Medium
600	Non-negative Integers without Consecutive Ones	186	251	65	Hard
1024	Video Stitching	185	201	16	Medium
837	New 21 Game	178	368	190	Medium
1039	Minimum Score Triangulation of Polygon	176	200	24	Medium
1130	Minimum Cost Tree From Leaf Values	173	191	18	Medium
1092	Shortest Common Supersequence	168	174	6	Hard
1048	Longest String Chain	166	179	13	Medium
903	Valid Permutations for DI Sequence	165	190	25	Hard
960	Delete Columns to Make Sorted III	163	167	4	Hard
1143	Longest Common Subsequence	160	168	8	Medium
629	K Inverse Pairs Array	153	226	73	Hard
1125	Smallest Sufficient Team	148	154	6	Hard
879	Profitable Schemes	144	164	20	Hard
943	Find the Shortest Superstring	140	196	56	Hard
1186	Maximum Subarray Sum with One Deletion	140	146	6	Medium
790	Domino and Tromino Tiling	135	274	139	Medium
1074	Number of Submatrices That Sum to Target	135	140	5	Hard
1155	Number of Dice Rolls With Target Sum	128	141	13	Medium
517	Super Washing Machines	99	216	117	Hard
1140	Stone Game II	93	117	24	Medium
1187	Make Array Strictly Increasing	91	92	1	Hard
902	Numbers At Most N Given Digit Set	84	111	27	Hard
978	Longest Turbulent Subarray	76	125	49	Medium
964	Least Operators to Express Number	74	111	37	Hard
967	Numbers With Same Consecutive Differences	73	108	35	Medium
1147	Longest Chunked Palindrome Decomposition	71	78	7	Hard
1012	Numbers With Repeated Digits	66	99	33	Hard
1139	Largest 1-Bordered Square	45	66	21	Medium
638	Shopping Offers	38	398	360	Medium
466	Count The Repetitions	27	122	95	Hard
982	Triples with Bitwise AND Equal To Zero	-26	65	91	Hard
639	Decode Ways II	-99	294	393	Hard
87	Scramble String	-205	335	540	Hard
375	Guess Number Higher or Lower II	-248	577	825	Medium
91	Decode Ways	-253	1639	1892	Medium
1025	Divisor Game	-274	144	418	Easy
808	Soup Servings	-275	104	379	Medium
877	Stone Game	-279	383	662	Medium
523	Continuous Subarray Sum	-282	780	1062	Medium
303	Range Sum Query - Immutable	-299	537	836	Easy
357	Count Numbers with Unique Digits	-401	270	671	Medium

Math

ID	Title	Net Profit	Likes	Dislikes	Difficulty
2	Add Two Numbers	4381	5919	1538	Medium
279	Perfect Squares	1554	1696	142	Medium
264	Ugly Number II	1009	1080	71	Medium
67	Add Binary	919	1138	219	Easy
204	Count Primes	818	1259	441	Easy
224	Basic Calculator	801	902	101	Hard
202	Happy Number	740	1004	264	Easy
60	Permutation Sequence	702	960	258	Medium
168	Excel Sheet Column Title	653	818	165	Easy
43	Multiply Strings	634	1168	534	Medium
670	Maximum Swap	589	637	48	Medium
368	Largest Divisible Subset	584	616	32	Medium
413	Arithmetic Slices	528	661	133	Medium
171	Excel Sheet Column Number	501	619	118	Easy
628	Maximum Product of Three Numbers	483	766	283	Easy
343	Integer Break	474	658	184	Medium
367	Valid Perfect Square	399	513	114	Easy
887	Super Egg Drop	392	438	46	Hard
231	Power of Two	362	500	138	Easy
462	Minimum Moves to Equal Array Elements II	348	379	31	Medium
942	DI String Match	333	517	184	Easy
836	Rectangle Overlap	323	401	78	Easy
313	Super Ugly Number	305	413	108	Medium
9	Palindrome Number	239	1609	1370	Easy
780	Reaching Points	222	278	56	Hard
728	Self Dividing Numbers	216	465	249	Easy
645	Set Mismatch	206	457	251	Easy
914	X of a Kind in a Deck of Cards	204	270	66	Easy
805	Split Array With Same Average	202	253	51	Hard
396	Rotate Function	193	288	95	Medium
1109	Corporate Flight Bookings	176	205	29	Medium
976	Largest Perimeter Triangle	173	198	25	Easy
996	Number of Squareful Arrays	161	174	13	Hard
991	Broken Calculator	129	183	54	Medium
633	Sum of Square Numbers	125	371	246	Easy
775	Global and Local Inversions	105	228	123	Medium
517	Super Washing Machines	99	216	117	Hard
952	Largest Component Size by Common Factor	92	124	32	Hard
902	Numbers At Most N Given Digit Set	84	111	27	Hard
910	Smallest Range II	82	206	124	Medium
878	Nth Magical Number	79	121	42	Hard
869	Reordered Power of 2	78	145	67	Medium
964	Least Operators to Express Number	74	111	37	Hard
1103	Distribute Candies to People	71	98	27	Easy
927	Three Equal Parts	69	108	39	Hard
1009	Complement of Base 10 Integer	66	81	15	Easy
1012	Numbers With Repeated Digits	66	99	33	Hard
891	Sum of Subsequence Widths	59	140	81	Hard
754	Reach a Number	56	327	271	Easy
1041	Robot Bounded In Circle	35	116	81	Medium
1073	Adding Two Negabinary Numbers	29	61	32	Medium
1104	Path In Zigzag Labelled Binary Tree	23	106	83	Medium
782	Transform to Chessboard	-9	91	100	Hard
1131	Maximum of Absolute Value Expression	-14	58	72	Medium
397	Integer Replacement	-20	238	258	Medium
1017	Convert to Base -2	-21	89	110	Medium
1154	Day of the Year	-25	37	62	Easy
899	Orderly Queue	-27	122	149	Hard
1175	Prime Arrangements	-36	34	70	Easy
753	Cracking the Safe	-39	318	357	Hard
892	Surface Area of 3D Shapes	-46	172	218	Easy
963	Minimum Area Rectangle II	-50	80	130	Medium
1006	Clumsy Factorial	-51	49	100	Medium
781	Rabbits in Forest	-53	173	226	Medium
885	Spiral Matrix III	-66	116	182	Medium
478	Generate Random Point in a Circle	-71	108	179	Medium
972	Equal Rational Numbers	-71	32	103	Hard
906	Super Palindromes	-81	53	134	Hard
858	Mirror Reflection	-91	144	235	Medium
829	Consecutive Numbers Sum	-96	192	288	Hard
970	Powerful Integers	-101	79	180	Easy
1037	Valid Boomerang	-104	47	151	Easy
810	Chalkboard XOR Game	-112	44	156	Hard
1093	Statistics from a Large Sample	-119	29	148	Medium
592	Fraction Addition and Subtraction	-122	126	248	Medium
1015	Smallest Integer Divisible by K	-126	59	185	Medium
789	Escape The Ghosts	-137	138	275	Medium
593	Valid Square	-149	147	296	Medium
949	Largest Time for Given Digits	-149	86	235	Easy
483	Smallest Good Base	-170	99	269	Hard
866	Prime Palindrome	-180	95	275	Medium
335	Self Crossing	-190	92	282	Hard
263	Ugly Number	-219	265	484	Easy
453	Minimum Moves to Equal Array Elements	-223	408	631	Easy
868	Binary Gap	-223	142	365	Easy
172	Factorial Trailing Zeroes	-239	545	784	Easy
640	Solve the Equation	-248	175	423	Medium
794	Valid Tic-Tac-Toe State	-257	115	372	Medium
1025	Divisor Game	-274	144	418	Easy
223	Rectangle Area	-275	273	548	Medium
441	Arranging Coins	-275	219	494	Easy
598	Range Addition II	-279	208	487	Easy
877	Stone Game	-279	383	662	Medium
523	Continuous Subarray Sum	-282	780	1062	Medium
233	Number of Digit One	-298	191	489	Hard
507	Perfect Number	-307	175	482	Easy
258	Add Digits	-337	507	844	Easy
423	Reconstruct Original Digits from English	-338	129	467	Medium
365	Water and Jug Problem	-368	184	552	Medium
319	Bulb Switcher	-390	313	703	Medium
268	Missing Number	-392	1086	1478	Easy
357	Count Numbers with Unique Digits	-401	270	671	Medium
883	Projection Area of 3D Shapes	-417	163	580	Easy
458	Poor Pigs	-425	314	739	Hard
537	Complex Number Multiplication	-429	178	607	Medium
372	Super Pow	-454	145	599	Medium
535	Encode and Decode TinyURL	-594	502	1096	Medium
908	Smallest Range I	-613	132	745	Easy
400	Nth Digit	-629	278	907	Medium
69	Sqrt(x)	-630	875	1505	Easy
166	Fraction to Recurring Decimal	-641	530	1171	Medium
672	Bulb Switcher II	-642	102	744	Medium
812	Largest Triangle Area	-654	122	776	Easy
326	Power of Three	-830	324	1154	Easy
553	Optimal Division	-862	131	993	Medium
149	Max Points on a Line	-910	556	1466	Hard
273	Integer to English Words	-1115	626	1741	Hard
7	Reverse Integer	-1344	2416	3760	Easy
50	Pow(x, n)	-1386	951	2337	Medium
12	Integer to Roman	-1424	675	2099	Medium
13	Roman to Integer	-1424	1431	2855	Easy
29	Divide Two Integers	-2941	765	3706	Medium
65	Valid Number	-3072	500	3572	Hard
8	String to Integer (atoi)	-5642	1078	6720	Medium

String

ID	Title	Net Profit	Likes	Dislikes	Difficulty
3	Longest Substring Without Repeating Characters	5945	6303	358	Medium
5	Longest Palindromic Substring	3885	4281	396	Medium
20	Valid Parentheses	3165	3320	155	Easy
22	Generate Parentheses	3038	3234	196	Medium
76	Minimum Window Substring	2554	2735	181	Hard
10	Regular Expression Matching	2450	3016	566	Hard
72	Edit Distance	2404	2441	37	Hard
17	Letter Combinations of a Phone Number	2213	2548	335	Medium
32	Longest Valid Parentheses	2131	2232	101	Hard
49	Group Anagrams	1865	1993	128	Medium
647	Palindromic Substrings	1533	1615	82	Medium
44	Wildcard Matching	1182	1260	78	Hard
387	First Unique Character in a String	1091	1177	86	Easy
126	Word Ladder II	945	1147	202	Hard
67	Add Binary	919	1138	219	Easy
97	Interleaving String	858	908	50	Hard
680	Valid Palindrome II	818	878	60	Easy
459	Repeated Substring Pattern	784	890	106	Easy
336	Palindrome Pairs	775	899	124	Hard
583	Delete Operation for Two Strings	755	775	20	Medium
115	Distinct Subsequences	746	785	39	Hard
632	Smallest Range Covering Elements from K Lists	743	765	22	Hard
678	Valid Parenthesis String	727	752	25	Medium
227	Basic Calculator II	692	837	145	Medium
214	Shortest Palindrome	654	742	88	Hard
767	Reorganize String	649	685	36	Medium
43	Multiply Strings	634	1168	534	Medium
856	Score of Parentheses	626	651	25	Medium
557	Reverse Words in a String III	624	695	71	Easy
696	Count Binary Substrings	566	690	124	Easy
93	Restore IP Addresses	451	775	324	Medium
929	Unique Email Addresses	412	564	152	Easy
890	Find and Replace Pattern	389	432	43	Medium
415	Add Strings	327	492	165	Easy
791	Custom Sort String	316	455	139	Medium
344	Reverse String	304	863	559	Easy
730	Count Different Palindromic Subsequences	302	338	36	Hard
556	Next Greater Element III	265	394	129	Medium
917	Reverse Only Letters	263	292	29	Easy
925	Long Pressed Name	244	280	36	Easy
383	Ransom Note	222	356	134	Easy
842	Split Array into Fibonacci Sequence	194	296	102	Medium
539	Minimum Time Difference	186	279	93	Medium
657	Robot Return to Origin	168	752	584	Easy
848	Shifting Letters	143	180	37	Medium
916	Word Subsets	143	196	53	Medium
859	Buddy Strings	139	350	211	Easy
14	Longest Common Prefix	136	1593	1457	Easy
1081	Smallest Subsequence of Distinct Characters	135	165	30	Medium
520	Detect Capital	121	337	216	Easy
761	Special Binary String	119	194	75	Hard
1106	Parsing A Boolean Expression	119	127	8	Hard
1156	Swap For Longest Repeated Character Substring	117	124	7	Medium
1071	Greatest Common Divisor of Strings	93	144	51	Easy
936	Stamping The Sequence	76	106	30	Hard
804	Unique Morse Code Words	54	484	430	Easy
736	Parse Lisp Expression	28	180	152	Hard
1138	Alphabet Board Path	26	59	33	Medium
1096	Brace Expansion II	24	79	55	Hard
1023	Camelcase Matching	5	88	83	Medium
1177	Can Make Palindrome from Substring	5	74	69	Medium
686	Repeated String Match	1	552	551	Easy
899	Orderly Queue	-27	122	149	Hard
1170	Compare Strings by Frequency of the Smallest Character	-32	36	68	Easy
1003	Check If Word Is Valid After Substitutions	-67	101	168	Medium
833	Find And Replace in String	-73	191	264	Medium
966	Vowel Spellchecker	-76	78	154	Medium
1163	Last Substring in Lexicographical Order	-86	51	137	Hard
816	Ambiguous Coordinates	-91	85	176	Medium
1016	Binary String With Substrings Representing 1 To N	-143	56	199	Medium
609	Find Duplicate File in System	-154	271	425	Medium
831	Masking Personal Information	-178	53	231	Medium
87	Scramble String	-205	335	540	Hard
1108	Defanging an IP Address	-221	93	314	Easy
606	Construct String from Binary Tree	-225	574	799	Easy
1169	Invalid Transactions	-228	21	249	Medium
91	Decode Ways	-253	1639	1892	Medium
591	Tag Validator	-256	62	318	Hard
809	Expressive Words	-270	129	399	Medium
824	Goat Latin	-281	168	449	Easy
770	Basic Calculator IV	-340	43	383	Hard
30	Substring with Concatenation of All Words	-378	613	991	Hard
345	Reverse Vowels of a String	-385	433	818	Easy
522	Longest Uncommon Subsequence II	-386	118	504	Medium
722	Remove Comments	-414	184	598	Medium
537	Complex Number Multiplication	-429	178	607	Medium
434	Number of Segments in a String	-447	152	599	Easy
28	Implement strStr()	-456	1028	1484	Easy
937	Reorder Data in Log Files	-456	233	689	Easy
385	Mini Parser	-468	182	650	Medium
551	Student Attendance Record I	-473	166	639	Easy
564	Find the Closest Palindrome	-483	167	650	Hard
819	Most Common Word	-523	360	883	Easy
788	Rotated Digits	-555	230	785	Easy
541	Reverse String II	-575	272	847	Easy
893	Groups of Special-Equivalent Strings	-646	164	810	Easy
468	Validate IP Address	-706	144	850	Medium
68	Text Justification	-724	416	1140	Hard
709	To Lower Case	-808	328	1136	Easy
71	Simplify Path	-826	496	1322	Medium
165	Compare Version Numbers	-853	334	1187	Medium
553	Optimal Division	-862	131	993	Medium
443	String Compression	-941	434	1375	Easy
273	Integer to English Words	-1115	626	1741	Hard
125	Valid Palindrome	-1330	684	2014	Easy
58	Length of Last Word	-1361	433	1794	Easy
12	Integer to Roman	-1423	676	2099	Medium
13	Roman to Integer	-1424	1431	2855	Easy
151	Reverse Words in a String	-1767	642	2409	Medium
6	ZigZag Conversion	-2406	1180	3586	Medium
65	Valid Number	-3072	500	3572	Hard
521	Longest Uncommon Subsequence I	-3344	223	3567	Easy
8	String to Integer (atoi)	-5642	1078	6720	Medium
38	Count and Say	-6040	888	6928	Easy

Tree

ID	Title	Net Profit	Likes	Dislikes	Difficulty
101	Symmetric Tree	2554	2611	57	Easy
236	Lowest Common Ancestor of a Binary Tree	2172	2316	144	Medium
437	Path Sum III	2028	2151	123	Easy
105	Construct Binary Tree from Preorder and Inorder Traversal	1992	2048	56	Medium
98	Validate Binary Search Tree	1985	2333	348	Medium
226	Invert Binary Tree	1952	1987	35	Easy
96	Unique Binary Search Trees	1941	2018	77	Medium
617	Merge Two Binary Trees	1900	2039	139	Easy
94	Binary Tree Inorder Traversal	1833	1918	85	Medium
124	Binary Tree Maximum Path Sum	1816	1963	147	Hard
297	Serialize and Deserialize Binary Tree	1758	1849	91	Hard
337	House Robber III	1709	1744	35	Medium
102	Binary Tree Level Order Traversal	1708	1753	45	Medium
543	Diameter of Binary Tree	1556	1659	103	Easy
114	Flatten Binary Tree to Linked List	1513	1742	229	Medium
104	Maximum Depth of Binary Tree	1487	1546	59	Easy
173	Binary Search Tree Iterator	1356	1607	251	Medium
538	Convert BST to Greater Tree	1353	1446	93	Easy
95	Unique Binary Search Trees II	1327	1450	123	Medium
230	Kth Smallest Element in a BST	1314	1357	43	Medium
110	Balanced Binary Tree	1303	1430	127	Easy
572	Subtree of Another Tree	1275	1326	51	Easy
100	Same Tree	1254	1297	43	Easy
108	Convert Sorted Array to Binary Search Tree	1242	1390	148	Easy
199	Binary Tree Right Side View	1188	1252	64	Medium
235	Lowest Common Ancestor of a Binary Search Tree	1164	1252	88	Easy
669	Trim a Binary Search Tree	1118	1255	137	Easy
103	Binary Tree Zigzag Level Order Traversal	1100	1168	68	Medium
654	Maximum Binary Tree	1077	1238	161	Medium
116	Populating Next Right Pointers in Each Node	1069	1169	100	Medium
222	Count Complete Tree Nodes	1042	1194	152	Medium
145	Binary Tree Postorder Traversal	1030	1086	56	Hard
113	Path Sum II	1021	1059	38	Medium
450	Delete Node in a BST	994	1058	64	Medium
106	Construct Binary Tree from Inorder and Postorder Traversal	991	1012	21	Medium
863	All Nodes Distance K in Binary Tree	968	986	18	Medium
257	Binary Tree Paths	938	1016	78	Easy
99	Recover Binary Search Tree	886	937	51	Hard
117	Populating Next Right Pointers in Each Node II	870	1017	147	Medium
144	Binary Tree Preorder Traversal	863	908	45	Medium
653	Two Sum IV - Input is a BST	863	978	115	Easy
687	Longest Univalue Path	817	1098	281	Easy
129	Sum Root to Leaf Numbers	764	793	29	Medium
112	Path Sum	755	1115	360	Easy
637	Average of Levels in Binary Tree	752	880	128	Easy
449	Serialize and Deserialize BST	714	769	55	Medium
652	Find Duplicate Subtrees	693	860	167	Medium
979	Distribute Coins in Binary Tree	687	711	24	Medium
107	Binary Tree Level Order Traversal II	678	838	160	Easy
404	Sum of Left Leaves	659	743	84	Easy
814	Binary Tree Pruning	620	641	21	Medium
662	Maximum Width of Binary Tree	592	736	144	Medium
684	Redundant Connection	575	774	199	Medium
530	Minimum Absolute Difference in BST	553	596	43	Easy
513	Find Bottom Left Tree Value	516	623	107	Medium
515	Find Largest Value in Each Tree Row	510	558	48	Medium
834	Sum of Distances in Tree	491	517	26	Hard
894	All Possible Full Binary Trees	446	494	48	Medium
889	Construct Binary Tree from Preorder and Postorder Traversal	430	459	29	Medium
872	Leaf-Similar Trees	420	446	26	Easy
559	Maximum Depth of N-ary Tree	416	439	23	Easy
938	Range Sum of BST	401	493	92	Easy
111	Minimum Depth of Binary Tree	381	845	464	Easy
701	Insert into a Binary Search Tree	381	431	50	Medium
501	Find Mode in Binary Search Tree	375	623	248	Easy
685	Redundant Connection II	348	512	164	Hard
508	Most Frequent Subtree Sum	342	429	87	Medium
968	Binary Tree Cameras	328	339	11	Hard
958	Check Completeness of a Binary Tree	326	333	7	Medium
1008	Construct Binary Search Tree from Preorder Traversal	324	337	13	Medium
590	N-ary Tree Postorder Traversal	317	361	44	Easy
865	Smallest Subtree with all the Deepest Nodes	307	440	133	Medium
783	Minimum Distance Between BST Nodes	293	409	116	Easy
700	Search in a Binary Search Tree	288	384	96	Easy
951	Flip Equivalent Binary Trees	286	299	13	Medium
429	N-ary Tree Level Order Traversal	278	313	35	Easy
1110	Delete Nodes And Return Forest	251	256	5	Medium
993	Cousins in Binary Tree	250	269	19	Easy
589	N-ary Tree Preorder Traversal	249	290	41	Easy
1028	Recover a Tree From Preorder Traversal	210	218	8	Hard
965	Univalued Binary Tree	203	240	37	Easy
623	Add One Row to Tree	202	312	110	Medium
1026	Maximum Difference Between Node and Ancestor	185	195	10	Medium
1130	Minimum Cost Tree From Leaf Values	173	191	18	Medium
988	Smallest String Starting From Leaf	139	177	38	Medium
919	Complete Binary Tree Inserter	133	173	40	Medium
1022	Sum of Root To Leaf Binary Numbers	106	165	59	Easy
1145	Binary Tree Coloring Game	86	114	28	Medium
971	Flip Binary Tree To Match Preorder Traversal	72	142	70	Medium
1104	Path In Zigzag Labelled Binary Tree	23	106	83	Medium
897	Increasing Order Search Tree	-7	340	347	Easy
1123	Lowest Common Ancestor of Deepest Leaves	-34	88	122	Medium
998	Maximum Binary Tree II	-141	89	230	Medium
671	Second Minimum Node In a Binary Tree	-214	421	635	Easy
606	Construct String from Binary Tree	-225	574	799	Easy
987	Vertical Order Traversal of a Binary Tree	-230	182	412	Medium
655	Print Binary Tree	-363	244	607	Medium
563	Binary Tree Tilt	-469	358	827	Easy

Hash Table

ID	Title	Net Profit	Likes	Dislikes	Difficulty
1	Two Sum	11394	11800	406	Easy
3	Longest Substring Without Repeating Characters	5945	6303	358	Medium
136	Single Number	2719	2824	105	Easy
76	Minimum Window Substring	2554	2735	181	Hard
560	Subarray Sum Equals K	2332	2399	67	Medium
49	Group Anagrams	1865	1993	128	Medium
94	Binary Tree Inorder Traversal	1833	1918	85	Medium
347	Top K Frequent Elements	1702	1816	114	Medium
438	Find All Anagrams in a String	1671	1811	140	Medium
85	Maximal Rectangle	1637	1691	54	Hard
739	Daily Temperatures	1515	1561	46	Medium
138	Copy List with Random Pointer	1360	1844	484	Medium
771	Jewels and Stones	1288	1586	298	Easy
380	Insert Delete GetRandom O(1)	1229	1325	96	Medium
463	Island Perimeter	1123	1212	89	Easy
387	First Unique Character in a String	1091	1177	86	Easy
18	4Sum	993	1242	249	Medium
37	Sudoku Solver	989	1059	70	Hard
204	Count Primes	818	1259	441	Easy
692	Top K Frequent Words	811	896	85	Medium
336	Palindrome Pairs	775	899	124	Hard
451	Sort Characters By Frequency	749	823	74	Medium
632	Smallest Range Covering Elements from K Lists	743	765	22	Hard
525	Contiguous Array	741	781	40	Medium
202	Happy Number	740	1004	264	Easy
718	Maximum Length of Repeated Subarray	723	755	32	Medium
242	Valid Anagram	721	837	116	Easy
454	4Sum II	721	782	61	Medium
36	Valid Sudoku	649	1009	360	Medium
290	Word Pattern	639	734	95	Easy
205	Isomorphic Strings	618	866	248	Easy
554	Brick Wall	579	610	31	Medium
895	Maximum Frequency Stack	545	556	11	Hard
409	Longest Palindrome	533	597	64	Easy
350	Intersection of Two Arrays II	515	802	287	Easy
381	Insert Delete GetRandom O(1) - Duplicates allowed	438	488	50	Hard
355	Design Twitter	417	561	144	Medium
992	Subarrays with K Different Integers	407	415	8	Hard
594	Longest Harmonious Subsequence	397	459	62	Easy
648	Replace Words	374	487	113	Medium
974	Subarray Sums Divisible by K	372	406	34	Medium
1002	Find Common Characters	352	404	52	Easy
508	Most Frequent Subtree Sum	342	429	87	Medium
706	Design HashMap	335	402	67	Easy
389	Find the Difference	311	554	243	Easy
676	Implement Magic Dictionary	297	401	104	Medium
187	Repeated DNA Sequences	290	495	205	Medium
939	Minimum Area Rectangle	267	330	63	Medium
599	Minimum Index Sum of Two Lists	247	403	156	Easy
930	Binary Subarrays With Sum	246	258	12	Medium
981	Time Based Key-Value Store	244	290	46	Medium
645	Set Mismatch	206	457	251	Easy
884	Uncommon Words from Two Sentences	192	258	66	Easy
953	Verifying an Alien Dictionary	174	267	93	Easy
1048	Longest String Chain	166	179	13	Medium
726	Number of Atoms	160	248	88	Hard
710	Random Pick with Blacklist	148	193	45	Hard
705	Design HashSet	124	169	45	Easy
954	Array of Doubled Pairs	114	137	23	Medium
1072	Flip Columns For Maximum Number of Equal Rows	108	120	12	Medium
961	N-Repeated Element in Size 2N Array	99	253	154	Easy
1178	Number of Valid Words for Each Puzzle	85	93	8	Hard
1001	Grid Illumination	62	108	46	Hard
1160	Find Words That Can Be Formed by Characters	55	72	17	Easy
1138	Alphabet Board Path	26	59	33	Medium
1044	Longest Duplicate Substring	17	95	78	Hard
299	Bulls and Cows	-20	389	409	Easy
1078	Occurrences After Bigram	-25	54	79	Easy
690	Employee Importance	-27	438	465	Easy
781	Rabbits in Forest	-53	173	226	Medium
966	Vowel Spellchecker	-76	78	154	Medium
1090	Largest Values From Labels	-96	43	139	Medium
217	Contains Duplicate	-100	466	566	Easy
970	Powerful Integers	-101	79	180	Easy
720	Longest Word in Dictionary	-103	396	499	Easy
500	Keyboard Row	-113	429	542	Easy
219	Contains Duplicate II	-131	569	700	Easy
957	Prison Cells After N Days	-152	179	331	Medium
609	Find Duplicate File in System	-154	271	425	Medium
811	Subdomain Visit Count	-163	301	464	Easy
447	Number of Boomerangs	-180	317	497	Easy
987	Vertical Order Traversal of a Binary Tree	-230	182	412	Medium
274	H-Index	-322	433	755	Medium
770	Basic Calculator IV	-340	43	383	Hard
748	Shortest Completing Word	-346	137	483	Easy
30	Substring with Concatenation of All Words	-378	613	991	Hard
575	Distribute Candies	-392	326	718	Easy
349	Intersection of Two Arrays	-411	470	881	Easy
535	Encode and Decode TinyURL	-594	502	1096	Medium
166	Fraction to Recurring Decimal	-641	530	1171	Medium
149	Max Points on a Line	-910	556	1466	Hard

Depth-first Search

ID	Title	Net Profit	Likes	Dislikes	Difficulty
200	Number of Islands	3002	3111	109	Medium
101	Symmetric Tree	2554	2611	57	Easy
207	Course Schedule	2059	2161	102	Medium
105	Construct Binary Tree from Preorder and Inorder Traversal	1992	2048	56	Medium
98	Validate Binary Search Tree	1985	2333	348	Medium
124	Binary Tree Maximum Path Sum	1816	1963	147	Hard
394	Decode String	1731	1829	98	Medium
337	House Robber III	1709	1744	35	Medium
301	Remove Invalid Parentheses	1609	1680	71	Hard
494	Target Sum	1522	1596	74	Medium
114	Flatten Binary Tree to Linked List	1513	1742	229	Medium
104	Maximum Depth of Binary Tree	1487	1546	59	Easy
110	Balanced Binary Tree	1303	1430	127	Easy
100	Same Tree	1254	1297	43	Easy
108	Convert Sorted Array to Binary Search Tree	1242	1390	148	Easy
199	Binary Tree Right Side View	1188	1252	64	Medium
695	Max Area of Island	1179	1243	64	Medium
329	Longest Increasing Path in a Matrix	1163	1184	21	Hard
109	Convert Sorted List to Binary Search Tree	1137	1209	72	Medium
210	Course Schedule II	1103	1186	83	Medium
547	Friend Circles	1088	1184	96	Medium
116	Populating Next Right Pointers in Each Node	1069	1169	100	Medium
113	Path Sum II	1021	1059	38	Medium
106	Construct Binary Tree from Inorder and Postorder Traversal	991	1012	21	Medium
863	All Nodes Distance K in Binary Tree	968	986	18	Medium
257	Binary Tree Paths	938	1016	78	Easy
99	Recover Binary Search Tree	886	937	51	Hard
117	Populating Next Right Pointers in Each Node II	870	1017	147	Medium
129	Sum Root to Leaf Numbers	764	793	29	Medium
112	Path Sum	755	1115	360	Easy
542	01 Matrix	724	806	82	Medium
979	Distribute Coins in Binary Tree	687	711	24	Medium
785	Is Graph Bipartite?	675	772	97	Medium
417	Pacific Atlantic Water Flow	616	753	137	Medium
743	Network Delay Time	571	752	181	Medium
721	Accounts Merge	554	757	203	Medium
513	Find Bottom Left Tree Value	516	623	107	Medium
515	Find Largest Value in Each Tree Row	510	558	48	Medium
841	Keys and Rooms	507	551	44	Medium
834	Sum of Distances in Tree	491	517	26	Hard
130	Surrounded Regions	433	911	478	Medium
872	Leaf-Similar Trees	420	446	26	Easy
559	Maximum Depth of N-ary Tree	416	439	23	Easy
733	Flood Fill	405	526	121	Easy
947	Most Stones Removed with Same Row or Column	392	551	159	Medium
430	Flatten a Multilevel Doubly Linked List	387	461	74	Medium
491	Increasing Subsequences	385	472	87	Medium
111	Minimum Depth of Binary Tree	381	845	464	Easy
546	Remove Boxes	374	413	39	Hard
802	Find Eventual Safe States	362	426	64	Medium
685	Redundant Connection II	348	512	164	Hard
679	24 Game	346	440	94	Hard
473	Matchsticks to Square	328	370	42	Medium
968	Binary Tree Cameras	328	339	11	Hard
934	Shortest Bridge	320	346	26	Medium
778	Swim in Rising Water	315	348	33	Hard
886	Possible Bipartition	315	331	16	Medium
332	Reconstruct Itinerary	313	908	595	Medium
514	Freedom Trail	292	310	18	Hard
827	Making A Large Island	288	297	9	Hard
959	Regions Cut By Slashes	282	364	82	Medium
664	Strange Printer	252	289	37	Hard
1110	Delete Nodes And Return Forest	251	256	5	Medium
472	Concatenated Words	241	313	72	Hard
576	Out of Boundary Paths	215	328	113	Medium
1028	Recover a Tree From Preorder Traversal	210	218	8	Hard
980	Unique Paths III	200	239	39	Hard
1026	Maximum Difference Between Node and Ancestor	185	195	10	Medium
988	Smallest String Starting From Leaf	139	177	38	Medium
839	Similar String Groups	122	185	63	Hard
1020	Number of Enclaves	102	118	16	Medium
1145	Binary Tree Coloring Game	86	114	28	Medium
928	Minimize Malware Spread II	78	107	29	Hard
971	Flip Binary Tree To Match Preorder Traversal	72	142	70	Medium
924	Minimize Malware Spread	42	187	145	Hard
638	Shopping Offers	38	398	360	Medium
488	Zuma Game	7	148	141	Hard
529	Minesweeper	3	360	357	Medium
897	Increasing Order Search Tree	-7	340	347	Easy
690	Employee Importance	-27	438	465	Easy
851	Loud and Rich	-29	189	218	Medium
1123	Lowest Common Ancestor of Deepest Leaves	-34	88	122	Medium
753	Cracking the Safe	-39	318	357	Hard
133	Clone Graph	-44	945	989	Medium
756	Pyramid Transition Matrix	-78	202	280	Medium
1034	Coloring A Border	-86	54	140	Medium
749	Contain Virus	-122	51	173	Hard
1080	Insufficient Nodes in Root to Leaf Paths	-169	73	242	Medium

Binary Search

ID	Title	Net Profit	Likes	Dislikes	Difficulty
4	Median of Two Sorted Arrays	4239	4951	712	Hard
300	Longest Increasing Subsequence	2864	2933	69	Medium
33	Search in Rotated Sorted Array	2541	2898	357	Medium
287	Find the Duplicate Number	2537	2862	325	Medium
34	Find First and Last Position of Element in Sorted Array	1824	1921	97	Medium
240	Search a 2D Matrix II	1720	1774	54	Medium
378	Kth Smallest Element in a Sorted Matrix	1330	1419	89	Medium
35	Search Insert Position	1322	1522	200	Easy
230	Kth Smallest Element in a BST	1314	1357	43	Medium
315	Count of Smaller Numbers After Self	1297	1359	62	Hard
209	Minimum Size Subarray Sum	1245	1324	79	Medium
222	Count Complete Tree Nodes	1043	1195	152	Medium
153	Find Minimum in Rotated Sorted Array	1016	1195	179	Medium
410	Split Array Largest Sum	901	954	53	Hard
74	Search a 2D Matrix	884	1002	118	Medium
174	Dungeon Game	785	804	19	Hard
718	Maximum Length of Repeated Subarray	723	755	32	Medium
454	4Sum II	721	782	61	Medium
167	Two Sum II - Input array is sorted	630	1066	436	Easy
354	Russian Doll Envelopes	629	658	29	Hard
658	Find K Closest Elements	626	792	166	Medium
719	Find K-th Smallest Pair Distance	591	612	21	Hard
862	Shortest Subarray with Sum at Least K	541	556	15	Hard
392	Is Subsequence	523	665	142	Easy
350	Intersection of Two Arrays II	515	802	287	Easy
493	Reverse Pairs	500	588	88	Hard
81	Search in Rotated Sorted Array II	435	784	349	Medium
363	Max Sum of Rectangle No Larger Than K	434	470	36	Hard
367	Valid Perfect Square	399	513	114	Easy
887	Super Egg Drop	392	438	46	Hard
1011	Capacity To Ship Packages Within D Days	391	403	12	Medium
154	Find Minimum in Rotated Sorted Array II	385	541	156	Hard
327	Count of Range Sum	381	449	68	Hard
668	Kth Smallest Number in Multiplication Table	332	351	19	Hard
875	Koko Eating Bananas	319	354	35	Medium
778	Swim in Rising Water	315	348	33	Hard
704	Binary Search	287	321	34	Easy
278	First Bad Version	284	743	459	Easy
981	Time Based Key-Value Store	244	290	46	Medium
786	K-th Smallest Prime Fraction	235	249	14	Hard
710	Random Pick with Blacklist	148	193	45	Hard
352	Data Stream as Disjoint Intervals	142	207	65	Hard
436	Find Right Interval	135	237	102	Medium
1095	Find in Mountain Array	91	104	13	Hard
878	Nth Magical Number	79	121	42	Hard
1157	Online Majority Element In Subarray	72	86	14	Hard
793	Preimage Size of Factorial Zeroes Function	71	117	46	Hard
927	Three Equal Parts	69	108	39	Hard
911	Online Election	62	218	156	Medium
1044	Longest Duplicate Substring	17	95	78	Hard
497	Random Point in Non-overlapping Rectangles	-26	117	143	Medium
475	Heaters	-36	529	565	Easy
744	Find Smallest Letter Greater Than Target	-124	261	385	Easy
483	Smallest Good Base	-170	99	269	Hard
275	H-Index II	-179	227	406	Medium
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	-181	48	229	Medium
441	Arranging Coins	-275	219	494	Easy
528	Random Pick with Weight	-297	337	634	Medium
349	Intersection of Two Arrays	-411	470	881	Easy
852	Peak Index in a Mountain Array	-420	346	766	Easy
162	Find Peak Element	-503	994	1497	Medium
69	Sqrt(x)	-630	875	1505	Easy
374	Guess Number Higher or Lower	-1028	260	1288	Easy
50	Pow(x, n)	-1386	951	2337	Medium
29	Divide Two Integers	-2941	765	3706	Medium

Greedy

ID	Title	Net Profit	Likes	Dislikes	Difficulty
55	Jump Game	2130	2357	227	Medium
406	Queue Reconstruction by Height	1580	1782	202	Medium
621	Task Scheduler	1564	1906	342	Medium
45	Jump Game II	1344	1427	83	Hard
44	Wildcard Matching	1182	1260	78	Hard
763	Partition Labels	1153	1218	65	Medium
402	Remove K Digits	1031	1097	66	Medium
714	Best Time to Buy and Sell Stock with Transaction Fee	991	1024	33	Medium
316	Remove Duplicate Letters	795	875	80	Hard
767	Reorganize String	649	685	36	Medium
134	Gas Station	580	887	307	Medium
376	Wiggle Subsequence	561	612	51	Medium
435	Non-overlapping Intervals	546	571	25	Medium
452	Minimum Number of Arrows to Burst Balloons	536	563	27	Medium
392	Is Subsequence	523	665	142	Easy
135	Candy	468	598	130	Hard
630	Course Schedule III	443	467	24	Hard
765	Couples Holding Hands	359	408	49	Hard
659	Split Array into Consecutive Subsequences	353	596	243	Medium
921	Minimum Add to Make Parentheses Valid	313	340	27	Medium
330	Patching Array	289	352	63	Hard
881	Boats to Save People	285	308	23	Medium
321	Create Maximum Number	284	449	165	Hard
455	Assign Cookies	283	352	69	Easy
1029	Two City Scheduling	276	312	36	Easy
860	Lemonade Change	274	336	62	Easy
870	Advantage Shuffle	272	293	21	Medium
738	Monotone Increasing Digits	239	285	46	Medium
861	Score After Flipping Matrix	216	295	79	Medium
502	IPO	201	223	22	Hard
842	Split Array into Fibonacci Sequence	194	296	102	Medium
1094	Car Pooling	176	186	10	Medium
1046	Last Stone Weight	171	183	12	Easy
757	Set Intersection Size At Least Two	166	182	16	Hard
995	Minimum Number of K Consecutive Bit Flips	135	156	21	Hard
991	Broken Calculator	129	183	54	Medium
1005	Maximize Sum Of Array After K Negations	121	143	22	Easy
955	Delete Columns to Make Sorted II	111	143	32	Medium
910	Smallest Range II	82	206	124	Medium
936	Stamping The Sequence	76	106	30	Hard
927	Three Equal Parts	69	108	39	Hard
649	Dota2 Senate	51	219	168	Medium
1007	Minimum Domino Rotations For Equal Row	26	104	78	Medium
948	Bag of Tokens	15	111	96	Medium
984	String Without AAA or BBB	-69	115	184	Medium
1053	Previous Permutation With One Swap	-96	54	150	Medium
1090	Largest Values From Labels	-96	43	139	Medium
122	Best Time to Buy and Sell Stock II	-178	1227	1405	Easy
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	-181	48	229	Medium
874	Walking Robot Simulation	-434	87	521	Easy
944	Delete Columns to Make Sorted	-994	65	1059	Easy

Two Pointers

ID	Title	Net Profit	Likes	Dislikes	Difficulty
3	Longest Substring Without Repeating Characters	5945	6303	358	Medium
42	Trapping Rain Water	4234	4314	80	Hard
15	3Sum	3951	4458	507	Medium
11	Container With Most Water	3419	3889	470	Medium
76	Minimum Window Substring	2554	2735	181	Hard
287	Find the Duplicate Number	2537	2862	325	Medium
283	Move Zeroes	2256	2340	84	Easy
19	Remove Nth Node From End of List	1958	2118	160	Medium
75	Sort Colors	1772	1942	170	Medium
234	Palindrome Linked List	1648	1929	281	Easy
142	Linked List Cycle II	1559	1692	133	Medium
141	Linked List Cycle	1556	1782	226	Easy
209	Minimum Size Subarray Sum	1245	1324	79	Medium
16	3Sum Closest	1220	1316	96	Medium
763	Partition Labels	1153	1218	65	Medium
18	4Sum	993	1242	249	Medium
632	Smallest Range Covering Elements from K Lists	743	765	22	Hard
844	Backspace String Compare	722	771	49	Easy
567	Permutation in String	715	757	42	Medium
713	Subarray Product Less Than K	704	739	35	Medium
167	Two Sum II - Input array is sorted	630	1066	436	Easy
424	Longest Repeating Character Replacement	611	663	52	Medium
86	Partition List	582	796	214	Medium
350	Intersection of Two Arrays II	515	802	287	Easy
977	Squares of a Sorted Array	426	477	51	Easy
986	Interval List Intersections	416	434	18	Medium
992	Subarrays with K Different Integers	407	415	8	Hard
845	Longest Mountain in Array	356	370	14	Medium
1004	Max Consecutive Ones III	321	328	7	Medium
344	Reverse String	304	863	559	Easy
838	Push Dominoes	303	342	39	Medium
881	Boats to Save People	285	308	23	Medium
930	Binary Subarrays With Sum	246	258	12	Medium
925	Long Pressed Name	244	280	36	Easy
828	Unique Letter String	219	249	30	Hard
826	Most Profit Assigning Work	201	243	42	Medium
524	Longest Word in Dictionary through Deleting	181	371	190	Medium
923	3Sum With Multiplicity	179	223	44	Medium
80	Remove Duplicates from Sorted Array II	175	753	578	Medium
1093	Statistics from a Large Sample	-119	29	148	Medium
61	Rotate List	-168	705	873	Medium
904	Fruit Into Baskets	-288	523	811	Medium
30	Substring with Concatenation of All Words	-378	613	991	Hard
345	Reverse Vowels of a String	-385	433	818	Easy
349	Intersection of Two Arrays	-411	470	881	Easy
28	Implement strStr()	-456	1028	1484	Easy
532	K-diff Pairs in an Array	-507	393	900	Easy
457	Circular Array Loop	-818	182	1000	Medium
27	Remove Element	-1064	948	2012	Easy
125	Valid Palindrome	-1331	684	2015	Easy
88	Merge Sorted Array	-1766	1281	3047	Easy
26	Remove Duplicates from Sorted Array	-1965	1718	3683	Easy

Breadth-first Search

ID	Title	Net Profit	Likes	Dislikes	Difficulty
200	Number of Islands	3002	3111	109	Medium
101	Symmetric Tree	2554	2611	57	Easy
207	Course Schedule	2059	2161	102	Medium
102	Binary Tree Level Order Traversal	1708	1753	45	Medium
301	Remove Invalid Parentheses	1609	1680	71	Hard
279	Perfect Squares	1554	1696	142	Medium
199	Binary Tree Right Side View	1188	1252	64	Medium
210	Course Schedule II	1103	1186	83	Medium
103	Binary Tree Zigzag Level Order Traversal	1100	1168	68	Medium
310	Minimum Height Trees	1096	1167	71	Medium
863	All Nodes Distance K in Binary Tree	968	986	18	Medium
126	Word Ladder II	945	1147	202	Hard
127	Word Ladder	897	1786	889	Medium
787	Cheapest Flights Within K Stops	884	918	34	Medium
407	Trapping Rain Water II	772	795	23	Hard
542	01 Matrix	724	806	82	Medium
107	Binary Tree Level Order Traversal II	678	838	160	Easy
785	Is Graph Bipartite?	675	772	97	Medium
417	Pacific Atlantic Water Flow	616	753	137	Medium
743	Network Delay Time	571	752	181	Medium
513	Find Bottom Left Tree Value	516	623	107	Medium
515	Find Largest Value in Each Tree Row	510	558	48	Medium
815	Bus Routes	470	488	18	Hard
752	Open the Lock	434	460	26	Medium
130	Surrounded Regions	433	911	478	Medium
559	Maximum Depth of N-ary Tree	416	439	23	Easy
111	Minimum Depth of Binary Tree	381	845	464	Easy
773	Sliding Puzzle	362	377	15	Hard
994	Rotting Oranges	330	358	28	Easy
934	Shortest Bridge	320	346	26	Medium
847	Shortest Path Visiting All Nodes	311	349	38	Hard
429	N-ary Tree Level Order Traversal	278	313	35	Easy
993	Cousins in Binary Tree	250	269	19	Easy
864	Shortest Path to Get All Keys	222	230	8	Hard
854	K-Similar Strings	176	198	22	Hard
913	Cat and Mouse	156	201	45	Hard
675	Cut Off Trees for Golf Event	147	336	189	Hard
1129	Shortest Path with Alternating Colors	116	121	5	Medium
1162	As Far from Land as Possible	109	116	7	Medium
1091	Shortest Path in Binary Matrix	93	113	20	Medium
1036	Escape a Large Maze	36	110	74	Hard
529	Minesweeper	3	360	357	Medium
690	Employee Importance	-27	438	465	Easy
133	Clone Graph	-44	945	989	Medium
909	Snakes and Ladders	-300	168	468	Medium

Stack

ID	Title	Net Profit	Likes	Dislikes	Difficulty
42	Trapping Rain Water	4234	4314	80	Hard
20	Valid Parentheses	3165	3320	155	Easy
84	Largest Rectangle in Histogram	2200	2260	60	Hard
155	Min Stack	1840	2065	225	Easy
94	Binary Tree Inorder Traversal	1833	1918	85	Medium
394	Decode String	1731	1829	98	Medium
85	Maximal Rectangle	1637	1691	54	Hard
739	Daily Temperatures	1515	1561	46	Medium
173	Binary Search Tree Iterator	1356	1607	251	Medium
103	Binary Tree Zigzag Level Order Traversal	1100	1168	68	Medium
145	Binary Tree Postorder Traversal	1031	1087	56	Hard
402	Remove K Digits	1031	1097	66	Medium
144	Binary Tree Preorder Traversal	864	909	45	Medium
224	Basic Calculator	801	902	101	Hard
316	Remove Duplicate Letters	795	875	80	Hard
503	Next Greater Element II	743	791	48	Medium
844	Backspace String Compare	722	771	49	Easy
456	132 Pattern	673	718	45	Medium
341	Flatten Nested List Iterator	645	1111	466	Medium
856	Score of Parentheses	626	651	25	Medium
907	Sum of Subarray Minimums	594	638	44	Medium
895	Maximum Frequency Stack	545	556	11	Hard
232	Implement Queue using Stacks	536	653	117	Easy
331	Verify Preorder Serialization of a Binary Tree	524	557	33	Medium
735	Asteroid Collision	454	520	66	Medium
946	Validate Stack Sequences	323	332	9	Medium
921	Minimum Add to Make Parentheses Valid	313	340	27	Medium
975	Odd Even Jump	290	410	120	Hard
1019	Next Greater Node In Linked List	281	303	22	Medium
150	Evaluate Reverse Polish Notation	238	615	377	Medium
880	Decoded String at Index	232	291	59	Medium
1047	Remove All Adjacent Duplicates In String	207	227	20	Easy
901	Online Stock Span	202	256	54	Medium
1130	Minimum Cost Tree From Leaf Values	173	191	18	Medium
726	Number of Atoms	160	248	88	Hard
1124	Longest Well-Performing Interval	151	192	41	Medium
1003	Check If Word Is Valid After Substitutions	-67	101	168	Medium
225	Implement Stack using Queues	-78	383	461	Easy
1021	Remove Outermost Parentheses	-99	210	309	Easy
591	Tag Validator	-256	62	318	Hard
636	Exclusive Time of Functions	-320	496	816	Medium
770	Basic Calculator IV	-340	43	383	Hard
385	Mini Parser	-468	182	650	Medium
682	Baseball Game	-505	339	844	Easy
496	Next Greater Element I	-555	910	1465	Easy
71	Simplify Path	-826	496	1322	Medium

Backtracking

ID	Title	Net Profit	Likes	Dislikes	Difficulty
22	Generate Parentheses	3038	3234	196	Medium
10	Regular Expression Matching	2450	3016	566	Hard
39	Combination Sum	2322	2396	74	Medium
46	Permutations	2311	2386	75	Medium
78	Subsets	2238	2294	56	Medium
17	Letter Combinations of a Phone Number	2213	2548	335	Medium
79	Word Search	2053	2162	109	Medium
212	Word Search II	1282	1358	76	Hard
44	Wildcard Matching	1182	1260	78	Hard
47	Permutations II	1169	1216	47	Medium
51	N-Queens	1103	1153	50	Hard
131	Palindrome Partitioning	1059	1104	45	Medium
90	Subsets II	1004	1055	51	Medium
40	Combination Sum II	998	1048	50	Medium
37	Sudoku Solver	989	1059	70	Hard
126	Word Ladder II	945	1147	202	Hard
211	Add and Search Word - Data structure design	935	994	59	Medium
140	Word Break II	887	1153	266	Hard
77	Combinations	859	910	51	Medium
60	Permutation Sequence	702	960	258	Medium
784	Letter Case Permutation	658	748	90	Easy
216	Combination Sum III	657	694	37	Medium
93	Restore IP Addresses	451	775	324	Medium
526	Beautiful Arrangement	362	478	116	Medium
691	Stickers to Spell Word	249	275	26	Hard
1079	Letter Tile Possibilities	242	253	11	Medium
52	N-Queens II	201	325	124	Hard
980	Unique Paths III	200	239	39	Hard
842	Split Array into Fibonacci Sequence	194	296	102	Medium
996	Number of Squareful Arrays	161	174	13	Hard
306	Additive Number	-90	233	323	Medium
401	Binary Watch	-278	403	681	Easy
357	Count Numbers with Unique Digits	-401	270	671	Medium
89	Gray Code	-857	439	1296	Medium

Design

ID	Title	Net Profit	Likes	Dislikes	Difficulty
146	LRU Cache	3384	3523	139	Medium
155	Min Stack	1840	2065	225	Easy
208	Implement Trie (Prefix Tree)	1805	1840	35	Medium
297	Serialize and Deserialize Binary Tree	1758	1849	91	Hard
295	Find Median from Data Stream	1389	1416	27	Hard
173	Binary Search Tree Iterator	1356	1607	251	Medium
380	Insert Delete GetRandom O(1)	1229	1325	96	Medium
211	Add and Search Word - Data structure design	935	994	59	Medium
460	LFU Cache	722	808	86	Hard
341	Flatten Nested List Iterator	645	1111	466	Medium
232	Implement Queue using Stacks	536	653	117	Easy
381	Insert Delete GetRandom O(1) - Duplicates allowed	438	488	50	Hard
355	Design Twitter	417	561	144	Medium
432	All O`one Data Structure	342	399	57	Hard
706	Design HashMap	335	402	67	Easy
622	Design Circular Queue	236	293	57	Medium
705	Design HashSet	124	169	45	Easy
284	Peeking Iterator	98	322	224	Medium
641	Design Circular Deque	97	127	30	Medium
1172	Dinner Plate Stacks	56	61	5	Hard
225	Implement Stack using Queues	-78	383	461	Easy
707	Design Linked List	-127	357	484	Easy

Linked List

ID	Title	Net Profit	Likes	Dislikes	Difficulty
2	Add Two Numbers	4381	5919	1538	Medium
23	Merge k Sorted Lists	2701	2891	190	Hard
206	Reverse Linked List	2692	2761	69	Easy
21	Merge Two Sorted Lists	2234	2613	379	Easy
160	Intersection of Two Linked Lists	2158	2391	233	Easy
19	Remove Nth Node From End of List	1958	2118	160	Medium
234	Palindrome Linked List	1648	1929	281	Easy
148	Sort List	1609	1697	88	Medium
142	Linked List Cycle II	1559	1692	133	Medium
141	Linked List Cycle	1556	1782	226	Easy
138	Copy List with Random Pointer	1360	1844	484	Medium
92	Reverse Linked List II	1338	1439	101	Medium
24	Swap Nodes in Pairs	1257	1378	121	Medium
109	Convert Sorted List to Binary Search Tree	1137	1209	72	Medium
25	Reverse Nodes in k-Group	1096	1372	276	Hard
143	Reorder List	994	1073	79	Medium
82	Remove Duplicates from Sorted List II	917	1001	84	Medium
203	Remove Linked List Elements	887	946	59	Easy
83	Remove Duplicates from Sorted List	812	898	86	Easy
445	Add Two Numbers II	728	842	114	Medium
328	Odd Even Linked List	656	895	239	Medium
86	Partition List	582	796	214	Medium
876	Middle of the Linked List	572	614	42	Easy
430	Flatten a Multilevel Doubly Linked List	388	462	74	Medium
725	Split Linked List in Parts	324	408	84	Medium
1019	Next Greater Node In Linked List	281	303	22	Medium
1171	Remove Zero Sum Consecutive Nodes from Linked List	119	133	14	Medium
147	Insertion Sort List	-57	408	465	Medium
707	Design Linked List	-127	357	484	Easy
61	Rotate List	-168	705	873	Medium
817	Linked List Components	-376	244	620	Medium
237	Delete Node in a Linked List	-3322	869	4191	Easy

Sort

ID	Title	Net Profit	Likes	Dislikes	Difficulty
56	Merge Intervals	2294	2487	193	Medium
75	Sort Colors	1772	1942	170	Medium
148	Sort List	1609	1697	88	Medium
315	Count of Smaller Numbers After Self	1297	1359	62	Hard
179	Largest Number	1035	1189	154	Medium
57	Insert Interval	854	982	128	Hard
242	Valid Anagram	721	837	116	Easy
767	Reorganize String	649	685	36	Medium
973	K Closest Points to Origin	596	657	61	Medium
350	Intersection of Two Arrays II	515	802	287	Easy
493	Reverse Pairs	500	588	88	Hard
164	Maximum Gap	438	578	140	Hard
327	Count of Range Sum	381	449	68	Hard
922	Sort Array By Parity II	313	347	34	Easy
324	Wiggle Sort II	306	697	391	Medium
1122	Relative Sort Array	184	200	16	Easy
524	Longest Word in Dictionary through Deleting	181	371	190	Medium
976	Largest Perimeter Triangle	173	198	25	Easy
710	Random Pick with Blacklist	148	193	45	Hard
1054	Distant Barcodes	144	154	10	Medium
853	Car Fleet	129	283	154	Medium
1030	Matrix Cells in Distance Order	42	100	58	Easy
220	Contains Duplicate III	0	747	747	Medium
969	Pancake Sorting	-38	179	217	Medium
147	Insertion Sort List	-57	408	465	Medium
274	H-Index	-322	433	755	Medium
349	Intersection of Two Arrays	-411	470	881	Easy

Bit Manipulation

ID	Title	Net Profit	Likes	Dislikes	Difficulty
136	Single Number	2719	2824	105	Easy
78	Subsets	2238	2294	56	Medium
169	Majority Element	1776	1944	168	Easy
338	Counting Bits	1492	1608	116	Medium
461	Hamming Distance	1262	1392	130	Easy
260	Single Number III	898	979	81	Medium
137	Single Number II	679	947	268	Medium
784	Letter Case Permutation	658	748	90	Easy
421	Maximum XOR of Two Numbers in an Array	625	780	155	Medium
477	Total Hamming Distance	545	586	41	Medium
318	Maximum Product of Word Lengths	543	592	49	Medium
476	Number Complement	509	585	76	Easy
201	Bitwise AND of Numbers Range	418	484	66	Medium
190	Reverse Bits	412	633	221	Easy
231	Power of Two	362	500	138	Easy
389	Find the Difference	311	554	243	Easy
187	Repeated DNA Sequences	290	495	205	Medium
693	Binary Number with Alternating Bits	250	322	72	Easy
898	Bitwise ORs of Subarrays	231	294	63	Medium
405	Convert a Number to Hexadecimal	227	305	78	Easy
342	Power of Four	183	341	158	Easy
1125	Smallest Sufficient Team	148	154	6	Hard
1178	Number of Valid Words for Each Puzzle	85	93	8	Hard
191	Number of 1 Bits	79	498	419	Easy
1131	Maximum of Absolute Value Expression	-14	58	72	Medium
397	Integer Replacement	-20	238	258	Medium
756	Pyramid Transition Matrix	-78	202	280	Medium
762	Prime Number of Set Bits in Binary Representation	-89	168	257	Easy
401	Binary Watch	-278	403	681	Easy
268	Missing Number	-392	1086	1478	Easy
393	UTF-8 Validation	-605	161	766	Medium
371	Sum of Two Integers	-723	842	1565	Easy

Graph

ID	Title	Net Profit	Likes	Dislikes	Difficulty
207	Course Schedule	2059	2161	102	Medium
399	Evaluate Division	1407	1527	120	Medium
210	Course Schedule II	1103	1186	83	Medium
310	Minimum Height Trees	1096	1167	71	Medium
785	Is Graph Bipartite?	675	772	97	Medium
684	Redundant Connection	575	774	199	Medium
743	Network Delay Time	571	752	181	Medium
841	Keys and Rooms	507	551	44	Medium
802	Find Eventual Safe States	362	426	64	Medium
765	Couples Holding Hands	359	408	49	Hard
685	Redundant Connection II	348	512	164	Hard
332	Reconstruct Itinerary	313	908	595	Medium
959	Regions Cut By Slashes	282	364	82	Medium
1043	Partition Array for Maximum Sum	240	269	29	Medium
990	Satisfiability of Equality Equations	236	239	3	Medium
997	Find the Town Judge	194	231	37	Easy
854	K-Similar Strings	176	198	22	Hard
996	Number of Squareful Arrays	161	174	13	Hard
839	Similar String Groups	122	185	63	Hard
1129	Shortest Path with Alternating Colors	116	121	5	Medium
1162	As Far from Land as Possible	109	116	7	Medium
928	Minimize Malware Spread II	78	107	29	Hard
1161	Maximum Level Sum of a Binary Tree	64	70	6	Medium
1042	Flower Planting With No Adjacent	-29	115	144	Easy
133	Clone Graph	-44	945	989	Medium

Heap

ID	Title	Net Profit	Likes	Dislikes	Difficulty
23	Merge k Sorted Lists	2701	2891	190	Hard
215	Kth Largest Element in an Array	2186	2374	188	Medium
239	Sliding Window Maximum	1921	2040	119	Hard
347	Top K Frequent Elements	1702	1816	114	Medium
295	Find Median from Data Stream	1389	1416	27	Hard
378	Kth Smallest Element in a Sorted Matrix	1330	1419	89	Medium
218	The Skyline Problem	1308	1376	68	Hard
264	Ugly Number II	1009	1080	71	Medium
787	Cheapest Flights Within K Stops	884	918	34	Medium
692	Top K Frequent Words	811	896	85	Medium
407	Trapping Rain Water II	772	795	23	Hard
451	Sort Characters By Frequency	749	823	74	Medium
373	Find K Pairs with Smallest Sums	722	788	66	Medium
767	Reorganize String	649	685	36	Medium
973	K Closest Points to Origin	596	657	61	Medium
719	Find K-th Smallest Pair Distance	591	612	21	Hard
743	Network Delay Time	571	752	181	Medium
857	Minimum Cost to Hire K Workers	544	608	64	Hard
355	Design Twitter	417	561	144	Medium
871	Minimum Number of Refueling Stops	392	400	8	Hard
659	Split Array into Consecutive Subsequences	353	596	243	Medium
778	Swim in Rising Water	315	348	33	Hard
313	Super Ugly Number	305	413	108	Medium
818	Race Car	284	321	37	Hard
786	K-th Smallest Prime Fraction	235	249	14	Hard
864	Shortest Path to Get All Keys	222	230	8	Hard
502	IPO	201	223	22	Hard
703	Kth Largest Element in a Stream	185	372	187	Easy
1046	Last Stone Weight	171	183	12	Easy
1054	Distant Barcodes	144	154	10	Medium
882	Reachable Nodes In Subdivided Graph	10	107	97	Hard

Union Find

ID	Title	Net Profit	Likes	Dislikes	Difficulty
200	Number of Islands	3002	3111	109	Medium
128	Longest Consecutive Sequence	2027	2138	111	Hard
399	Evaluate Division	1407	1527	120	Medium
547	Friend Circles	1088	1184	96	Medium
684	Redundant Connection	575	774	199	Medium
721	Accounts Merge	554	757	203	Medium
130	Surrounded Regions	433	911	478	Medium
947	Most Stones Removed with Same Row or Column	392	551	159	Medium
765	Couples Holding Hands	359	408	49	Hard
685	Redundant Connection II	348	512	164	Hard
778	Swim in Rising Water	315	348	33	Hard
959	Regions Cut By Slashes	282	364	82	Medium
803	Bricks Falling When Hit	236	332	96	Hard
990	Satisfiability of Equality Equations	236	239	3	Medium
839	Similar String Groups	122	185	63	Hard
952	Largest Component Size by Common Factor	92	124	32	Hard
928	Minimize Malware Spread II	78	107	29	Hard
924	Minimize Malware Spread	42	187	145	Hard

Sliding Window

ID	Title	Net Profit	Likes	Dislikes	Difficulty
3	Longest Substring Without Repeating Characters	5945	6303	358	Medium
76	Minimum Window Substring	2554	2735	181	Hard
239	Sliding Window Maximum	1921	2040	119	Hard
567	Permutation in String	715	757	42	Medium
424	Longest Repeating Character Replacement	611	663	52	Medium
480	Sliding Window Median	442	494	52	Hard
992	Subarrays with K Different Integers	407	415	8	Hard
1004	Max Consecutive Ones III	321	328	7	Medium
995	Minimum Number of K Consecutive Bit Flips	135	156	21	Hard
1074	Number of Submatrices That Sum to Target	135	140	5	Hard
1052	Grumpy Bookstore Owner	120	133	13	Medium
978	Longest Turbulent Subarray	76	125	49	Medium
1040	Moving Stones Until Consecutive II	-19	79	98	Medium

Divide and Conquer

ID	Title	Net Profit	Likes	Dislikes	Difficulty
53	Maximum Subarray	4844	5032	188	Easy
4	Median of Two Sorted Arrays	4239	4951	712	Hard
23	Merge k Sorted Lists	2701	2891	190	Hard
215	Kth Largest Element in an Array	2186	2374	188	Medium
169	Majority Element	1776	1944	168	Easy
240	Search a 2D Matrix II	1720	1774	54	Medium
312	Burst Balloons	1494	1541	47	Hard
218	The Skyline Problem	1308	1376	68	Hard
315	Count of Smaller Numbers After Self	1297	1359	62	Hard
241	Different Ways to Add Parentheses	1042	1098	56	Medium
282	Expression Add Operators	684	796	112	Hard
973	K Closest Points to Origin	596	657	61	Medium
493	Reverse Pairs	500	588	88	Hard
327	Count of Range Sum	381	449	68	Hard
514	Freedom Trail	292	310	18	Hard
903	Valid Permutations for DI Sequence	165	190	25	Hard
932	Beautiful Array	-92	208	300	Medium

Trie

ID	Title	Net Profit	Likes	Dislikes	Difficulty
208	Implement Trie (Prefix Tree)	1805	1840	35	Medium
212	Word Search II	1282	1358	76	Hard
211	Add and Search Word - Data structure design	935	994	59	Medium
692	Top K Frequent Words	811	896	85	Medium
336	Palindrome Pairs	775	899	124	Hard
421	Maximum XOR of Two Numbers in an Array	625	780	155	Medium
648	Replace Words	374	487	113	Medium
676	Implement Magic Dictionary	297	401	104	Medium
677	Map Sum Pairs	272	334	62	Medium
472	Concatenated Words	241	313	72	Hard
1032	Stream of Characters	92	124	32	Hard
745	Prefix and Suffix Search	63	227	164	Hard
1023	Camelcase Matching	5	88	83	Medium
720	Longest Word in Dictionary	-103	396	499	Easy

Recursion

ID	Title	Net Profit	Likes	Dislikes	Difficulty
698	Partition to K Equal Sum Subsets	924	981	57	Medium
687	Longest Univalue Path	817	1098	281	Easy
894	All Possible Full Binary Trees	446	494	48	Medium
938	Range Sum of BST	401	493	92	Easy
783	Minimum Distance Between BST Nodes	293	409	116	Easy
779	K-th Symbol in Grammar	163	254	91	Medium
726	Number of Atoms	160	248	88	Hard
761	Special Binary String	119	194	75	Hard
1137	N-th Tribonacci Number	49	61	12	Easy
794	Valid Tic-Tac-Toe State	-257	115	372	Medium

Segment Tree

ID	Title	Net Profit	Likes	Dislikes	Difficulty
218	The Skyline Problem	1308	1376	68	Hard
315	Count of Smaller Numbers After Self	1297	1359	62	Hard
307	Range Sum Query - Mutable	738	804	66	Medium
493	Reverse Pairs	500	588	88	Hard
327	Count of Range Sum	381	449	68	Hard
715	Range Module	293	318	25	Hard
850	Rectangle Area II	188	211	23	Hard
732	My Calendar III	166	255	89	Hard
699	Falling Squares	147	182	35	Hard
1157	Online Majority Element In Subarray	72	86	14	Hard

Ordered Map

ID	Title	Net Profit	Likes	Dislikes	Difficulty
731	My Calendar II	354	420	66	Medium
715	Range Module	293	318	25	Hard
975	Odd Even Jump	290	410	120	Hard
846	Hand of Straights	272	319	47	Medium
855	Exam Room	198	365	167	Medium
732	My Calendar III	166	255	89	Hard
699	Falling Squares	147	182	35	Hard
352	Data Stream as Disjoint Intervals	142	207	65	Hard
220	Contains Duplicate III	0	747	747	Medium

Queue

ID	Title	Net Profit	Likes	Dislikes	Difficulty
621	Task Scheduler	1564	1906	342	Medium
862	Shortest Subarray with Sum at Least K	541	556	15	Hard
363	Max Sum of Rectangle No Larger Than K	434	470	36	Hard
622	Design Circular Queue	236	293	57	Medium
641	Design Circular Deque	97	127	30	Medium
933	Number of Recent Calls	-682	156	838	Easy

Minimax

ID	Title	Net Profit	Likes	Dislikes	Difficulty
486	Predict the Winner	1023	1095	72	Medium
464	Can I Win	561	686	125	Medium
913	Cat and Mouse	156	201	45	Hard
843	Guess the Word	-24	322	346	Hard
375	Guess Number Higher or Lower II	-248	577	825	Medium
877	Stone Game	-280	383	663	Medium
292	Nim Game	-813	408	1221	Easy

Binary Indexed Tree

ID	Title	Net Profit	Likes	Dislikes	Difficulty
218	The Skyline Problem	1308	1376	68	Hard
315	Count of Smaller Numbers After Self	1297	1359	62	Hard
307	Range Sum Query - Mutable	738	804	66	Medium
493	Reverse Pairs	500	588	88	Hard
327	Count of Range Sum	381	449	68	Hard

Random

ID	Title	Net Profit	Likes	Dislikes	Difficulty
470	Implement Rand10() Using Rand7()	150	234	84	Medium
710	Random Pick with Blacklist	148	193	45	Hard
519	Random Flip Matrix	63	106	43	Medium
497	Random Point in Non-overlapping Rectangles	-26	117	143	Medium
478	Generate Random Point in a Circle	-71	108	179	Medium
528	Random Pick with Weight	-297	337	634	Medium

Topological Sort

ID	Title	Net Profit	Likes	Dislikes	Difficulty
207	Course Schedule	2059	2161	102	Medium
329	Longest Increasing Path in a Matrix	1163	1184	21	Hard
210	Course Schedule II	1103	1186	83	Medium

Brainteaser

ID	Title	Net Profit	Likes	Dislikes	Difficulty
777	Swap Adjacent in LR String	19	246	227	Medium
1033	Moving Stones Until Consecutive	-249	30	279	Easy
319	Bulb Switcher	-390	313	703	Medium
292	Nim Game	-813	408	1221	Easy

Geometry

ID	Title	Net Profit	Likes	Dislikes	Difficulty
587	Erect the Fence	-8	146	154	Hard
892	Surface Area of 3D Shapes	-46	172	218	Easy
963	Minimum Area Rectangle II	-50	80	130	Medium

Line Sweep

ID	Title	Net Profit	Likes	Dislikes	Difficulty
218	The Skyline Problem	1308	1376	68	Hard
391	Perfect Rectangle	200	253	53	Hard
850	Rectangle Area II	188	211	23	Hard

Rejection Sampling

ID	Title	Net Profit	Likes	Dislikes	Difficulty
470	Implement Rand10() Using Rand7()	150	234	84	Medium
478	Generate Random Point in a Circle	-71	108	179	Medium

Reservoir Sampling

ID	Title	Net Profit	Likes	Dislikes	Difficulty
382	Linked List Random Node	285	411	126	Medium
398	Random Pick Index	-197	290	487	Medium

Binary Search Tree

ID	Title	Net Profit	Likes	Dislikes	Difficulty
1038	Binary Search Tree to Greater Sum Tree	248	292	44	Medium

Memoization

ID	Title	Net Profit	Likes	Dislikes	Difficulty
329	Longest Increasing Path in a Matrix	1163	1184	21	Hard

Rolling Hash

ID	Title	Net Profit	Likes	Dislikes	Difficulty
1147	Longest Chunked Palindrome Decomposition	71	78	7	Hard

Suffix Array

ID	Title	Net Profit	Likes	Dislikes	Difficulty
1163	Last Substring in Lexicographical Order	-86	51	137	Hard

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