This is a follow up of Shortest Word Distance. The only difference is now word1 could be the same as wo…

  Given two integer arrays A and B, return the maximum length of an subarray that appears in both arrays.…

  Given a string S, check if the letters can be rearranged so that two characters that are adjacent …

题目： Say you have an array for which the ith element is the price of a given stock on day i. Des…

You are a professional robber planning to rob houses along a street. Each house has a certain amount of money …

28. Implement strStr() 题目 Implement strStr(). Return the index of the first occurrence of needle in haystack, …

  Design and implement a data structure for Least Frequently Used (LFU) cache. It should suppor…

题目 https://leetcode.com/problems/binary-tree-paths/discuss/68279/C++-non-recursive-version-and-recursive-versi…

  Given two words (beginWord and endWord), and a dictionary’s word list, find all shortes…

  You’re now a baseball game point recorder. Given a list of strings, each string can be one of the…

题目： Given a collection of numbers, return all possible permutations. For example,[1,2,3] have the followi…

题目描述 There are a total of n courses you have to take, labeled from 0 to n – 1. Some courses may have pre…