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Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. The number of elements initialized in nums1 an…

Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. The minimum pa…

... Given a non-empty string containing only digits, determine the total number of ways to decode it. 当Sn-1Sn的数字在10-26之间，那么根据上述两种情况的描述，都可以满…

Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. 这道题一开始我没有想出来，看了题解才有思路。 …

You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways…

1 is read off as "one 1" or 11. 11 is read off as "two 1s" or 21. 21 is read off as "one 2, then one 1" or 1211. Given an integer n where 1…

Given two non-negative integers num1 and num2 represented as string, return the sum of num1 and num2. The length of both num1 and num2 is <…