292. Nim Game
You are playing the following Nim Game with your friend... » 阅读全文
684. Redundant Connection
In this problem, a tree is an undirected graph that is ... » 阅读全文
134. Gas Station
There are N gas stations along a circular route, where ... » 阅读全文
279. Perfect Squares
Given a positive integer n, find the least number of pe... » 阅读全文
3. Longest Substring Without Repeating Characters
Given a string s, find the length of the longest substr... » 阅读全文
207. Course Schedule
There are a total of numCourses courses you have to tak... » 阅读全文
637. Average of Levels in Binary Tree
Given a non-empty binary tree, return the average value... » 阅读全文
242. Valid Anagram
Given two strings s and t , write a function to determi... » 阅读全文
40. Combination Sum II
Given a collection of candidate numbers (candidates) an... » 阅读全文
2. Add Two Numbers
You are given two non-empty linked lists representing t... » 阅读全文