Install Dependencies 给定软件之间安装的依赖关系，用一个二维数组表示，第一维表示依赖的序号，第二维表示依赖关系，比如要先装deps[0][0]，才能装deps[0][1]。安装时，要尽可能先安装依赖个…

Maximum Depth of Binary Tree Given a binary tree, find its maximum depth. The maximum depth is the number of n…

Clone Graph Clone an undirected graph. Each node in the graph contains a label and a list of its neighbors. OJ…

  Given a binary tree, return the level order traversal of its nodes’ values. (ie, from l…

  Think about Zuma Game. You have a row of balls on the table, colored red(R), yellow(Y), blue(B), green(…

  You are given a string representing an attendance record for a student. The record only contains the fo…

  A Range Module is a module that tracks ranges of numbers. Your task is to design and implement the foll…

Bitwise AND of Numbers Range Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise…

First Bad Version You are a product manager and currently leading a team to develop a new product. Unfortunate…

Number of 1 Bits Write a function that takes an unsigned integer and returns the number of ’1′ bits it h…

  Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example:…

  There are 1000 buckets, one and only one of them contains poison, the rest are filled with water. They …