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
53. Maximum Subarray
Given an integer array nums, find the contiguous subarr... » 阅读全文
1. Two Sum
Given an array of integers, return indices of the two n... » 阅读全文