Given a string, find the length of the longest substring without repeating characters.E...
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3. Longest Substring Without Repeating Characters 不含重复字母的最长子串
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2. Add Two Numbers 链表表示的两数求和
You are given two linked lists representing two non-negative numbers. The digits are st...
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1. Two Sum两数之和
Given an array of integers, return indices of the two numbers such that they add up to ...
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349. Intersection of Two Arrays 数组交集
Given two arrays, write a function to compute their intersection.Example:Given nums1 = ...
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350. Intersection of Two Arrays II 数组交集2
Given two arrays, write a function to compute their intersection.Example:Given nums1 = ...
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357. Count Numbers with Unique Digits 统计各位不同的数字个数
Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < ...
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367. Valid Perfect Square 平方数
Given a positive integer num, write a function which returns True if num is a perfect s...
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371. Sum of Two Integers 两数求和
Calculate the sum of two integers a and b, but you are not allowed to use the operator ...
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374. Guess Number Higher or Lower猜数大小
We are playing the Guess Game. The game is as follows:I pick a number from 1 to n. You ...
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380. Insert Delete GetRandom O(1) O(1)时间的插入、删除和随机取元素
Design a data structure that supports all following operations in average O(1) time. in...
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382. Linked List Random Node 链表的随机结点 【蓄水池抽样】
Given a singly linked list, return a random node's value from the linked list. Each nod...
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387. First Unique Character in a String 字符串中的首个单独字母
Given a string, find the first non-repeating character in it and return it's index. If ...
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389. Find the Difference 找不同
Given two strings s and t which consist of only lowercase letters.String t is generated...
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392. Is Subsequence 判断子序列
Given a string s and a string t, check if s is subsequence of t.You may assume that the...
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396. Rotate Function 轮转函数
Given an array of integers A and let n to be its length.Assume Bk to be an array obtain...
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397. Integer Replacement 整数替换
Given a positive integer n and you can do operations as follow: What is the minimum num...
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404. Sum of Left Leaves 左叶子的和
Find the sum of all left leaves in a given binary tree.对给定的二叉树，返回其左叶子的和。Example: There ...
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409. Longest Palindrome 最长回文组合
Given a string which consists of lowercase or uppercase letters, find the length of the...
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412. Fizz Buzz 菲兹布兹
Write a program that outputs the string representation of numbers from 1 to n.But for m...
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414. Third Maximum Number 第三大元素
Given a non-empty array of integers, return the third maximum number in this array. If ...