刷题打卡

参考：https://programmercarl.com/%E4%BA%8C%E5%8F%89%E6%A0%91%E7%90%86%E8%AE%BA%E5%9F%BA%E7%A1%80.html 二

239. Sliding Window Maximum You are given an array of integers nums, there is a sliding window of si

20. Valid Parentheses Given a string s containing just the characters '(', ')', '{', '}', '[' and ']

--- highlight: a11y-dark --- # [232. Implement Queue using Stacks](https://leetcode.com/problems/imp

454. 4Sum II Given four integer arrays nums1, nums2, nums3, and nums4 all of length n, return the nu

28. Find the Index of the First Occurrence in a String Given two strings needle and haystack, return

344. Reverse String Write a function that reverses a string. The input string is given as an array o

242. Valid Anagram Given two strings s and t, return true if t is an anagram of s , and false otherw

24. Swap Nodes in Pairs https://leetcode.com/problems/swap-nodes-in-pairs/ Given a linked list, swap

203. Remove Linked List Elements https://leetcode.com/problems/remove-linked-list-elements/ Given th

977. Squares of a Sorted Array https://leetcode.com/problems/squares-of-a-sorted-array/description/

704. Binary Search https://leetcode.com/problems/binary-search/description/ Given an array of intege