Lawliet

题目：Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring.For "(()", the longest valid parentheses substring is "()", w

14. Longest Common PrefixDescriptionHintsSubmissionsDiscussSolution  DiscussPick One Write a function to find the longest common prefix string amongst an arra

Given an array of strings, group anagrams together.For example, given: ["eat", "tea", "tan", "ate", "nat", "bat"], Return:[ ["ate", "eat","tea"], ["nat","tan"], ["bat"]] Note: A

Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrangement is not possible, it must rearrange it as the lowest possible o

Given a linked list, remove the nth node from the end of list and return its head.For example,Given linked list: 1->2->3->4->5, and n = 2.After removing the second node from the end, the linked

Given n non-negative integers a1, a2, …, an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai) and (i, 0). Find two li

ZigZag Conversion DescriptionHintsSubmissionsDiscussSolutionDiscussPick OneThe string “PAYPALISHIRING” is written in a zigzag pattern on a given number of rows like this: (you may want to displa

Longest Palindromic Substring DescriptionHintsSubmissionsDiscussSolutionDiscussPick OneGiven a string s, find the longest palindromic substring in s. You may assume that the maximum length of s

Longest Substring Without Repeating Characters DescriptionHintsSubmissionsDiscussSolutionDiscussPick OneGiven a string, find the length of the longest substring without repeating characters.Ex

Add Two Numbers DescriptionHintsSubmissionsDiscussSolutionDiscussPick OneYou are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order a

Single Number III DescriptionHintsSubmissionsDiscussSolutionDiscussPick OneGiven an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactl

Single Number II DescriptionHintsSubmissionsDiscussSolutionDiscussPick OneGiven an array of integers, every element appears three times except for one, which appears exactly once. Find that sing

以前tao哥就讲过，在Leetcode里面分类是一个Easy的问题。public class Solution { public int singleNumber(int[] nums) { int ans = 0; for(int e : nums) { ans ^= e;