409. Longest Palindrome 1.问题描述 Given a string which consists of lowercase or uppercase letters, find...

290. Word Pattern(词语匹配) 1 问题描述 Given a pattern and a string str, find if str follows the same patter...

236. Lowest Common Ancestor of a Binary Tree(最近公共祖先) 1 问题描述 Given a binary tree, find the lowest com...

207. Course Schedule(课程安排) 1 问题描述 There are a total of n courses you have to take, labeled from 0 to...

199. Binary Tree Right Side View(侧面观察二叉树) 1 问题描述 Given a binary tree, imagine yourself standing on t...

187. Repeated DNA Sequences(重复的DNA序列) 1 问题描述 All DNA is composed of a series of nucleotides abbrevia...

114. Flatten Binary Tree to Linked List(二叉树转链表) 1.问题描述 Given a binary tree, flatten it to a linked l...

113. Path Sum II 1 问题描述 Given a binary tree and a sum, find all root-to-leaf paths where each path's...

70. Climbing Stairs爬楼梯问题 1.问题描述 You are climbing a stair case. It takes n steps to reach to the top....

49.Group Anagrams同字符词语分组 1 描述 Given an array of strings, group anagrams together. Example: Input: , ...