941. Valid Mountain Array-有效的山脉数组
Given an array of integers arr, return true if and only... » 阅读全文
938. Range Sum of BST-二叉搜索树的范围和
Given the root node of a binary search tree, return the... » 阅读全文
937. Reorder Data in Log Files-重新排列日志文件
You are given an array of logs. Each log is a space-del... » 阅读全文
933. Number of Recent Calls-最近的请求次数
写一个RecentCounter类来计算特定时间范围内最近的请求。 请你实现RecentCounter类： R... » 阅读全文
929. Unique Email Addresses-独特的电子邮件地址
Every email consists of a local name and a domain name,... » 阅读全文
925. Long Pressed Name-长按键入
Your friend is typing his name into a keyboard. Sometim... » 阅读全文
922. Sort Array By Parity II-按奇偶排序数组 II
Given an array A of non-negative integers, half of the ... » 阅读全文
917. Reverse Only Letters-仅仅反转字母
给你一个字符串s，根据下述规则反转字符串： 所有非英文字母保留在原有位置。 所有英文字母（小写或大写）位置反转... » 阅读全文
914. X of a Kind in a Deck of Cards-卡牌分组
In a deck of cards, each card has an integer written on... » 阅读全文
908. Smallest Range I-最小差值 I
Given an array A of integers, for each integer A[i] we ... » 阅读全文