链接：https://leetcode.com/problems/longest-common-prefix/#/description 难度：Easy 题目：14. Longest Common Prefix Writ…

题目 Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others ap…

LeetCode — 89. Gray Code 题目 The gray code is a binary numeral system where two successive values differ …

69. Sqrt(x) 题目 Implement int sqrt(int x). Compute and return the square root of x. x is guaranteed to be a non…

题目： Follow up for “Unique Paths”: Now consider if some obstacles are added to the grids. How many …

Given an array of citations (each citation is a non-negative integer) of a researcher, write a function to com…

Given a 2D binary matrix filled with 0’s and 1’s, find the largest square containing only 1’…

Easy 属于没什么算法那种题，逻辑简单，注意下细节就没事了。 class Solution { public String shortestCompletingWord(String licensePlate, Str…

35. 搜索插入位置 问题 给定一个排序数组和一个目标值，在数组中找到目标值，并返回其索引。如果目标值不存在于数组中，返回它将会被按顺序插入的位置。 你可以假设数组中无重复元素。 示例 1: 输入: [1,3,5,6],…

问题描述 Given a non-negative integer c, your task is to decide whether there’re two integers a and b such t…

  We had some 2-dimensional coordinates, like "(1, 3)" or "(2, 0.5)".  Then, we remov…

1. 题目 Given an array of integers, return indices of the two numbers such that they add up to a specific target…