Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in…

  There are a total of n courses you have to take, labeled from 0 to n - 1. Some…

题目： Follow up for “Search in Rotated Sorted Array”: What if duplicates are allowed? Woul…

题目： Given two words word1 and word2, find the minimum number of steps required to convert …

Maximum Expression Value I 给定一个整数数组，要求在数字之间任意添加乘号，加号和括号，使得最后表达式结果最大。比如1121,最大值为(1+1)*(2+1)，所有数字都是正数。 动态规划 复杂度 …

1. 题目 Implement int sqrt(int x). Compute and return the square root of x. 注：对于5，6，7，8等都返回2. 2. 思路 用牛顿开方法计算。原理：…

  Given a 2D board and a list of words from the dictionary, find all words in the board. Each word must b…

  There is a new alien language which uses the latin alphabet. However, the order among letters are unkno…

  You are given a binary tree in which each node contains an integer value. Find the number of paths that…

  Given a binary tree, you need to find the length of Longest Consecutive Path in Binary Tree. Especially…

题目描述 Follow up for “Remove Duplicates”: What if duplicates are allowed at most twice? For example, Given sorte…

Find Peak Element I A peak element is an element that is greater than its neighbors. Given an input array wher…