# 分类：LeetCode

## [LeetCode] Evaluate Reverse Polish Notation 计算逆波兰表达式

Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are&nbs…

## [Leetcode] Combinations 组合数

Combinations Given two integers n and k, return all possible ombinations of k numbers out of 1 … n. For …

## [LeetCode] Meeting Rooms 会议室

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...]&n…

## [LeetCode] Array Partition I 数组分割之一

Given an array of 2n integers, your task is to group these integers into n pairs of…

## LeetCode | First Missing Positive（第一个缺失的正整数）

Given an unsorted integer array, find the first missing positive integer. For example, Given [1,2,0] …

## [LeetCode] Equal Tree Partition 划分等价树

Given a binary tree with n nodes, your task is to check if it’s possible to partition t…

## LeetCode | Reverse Nodes in k-Group（k个结点一组翻转链表）

Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. If…

## [LeetCode] Container With Most Water 装最多水的容器,Trapping Rain Water 收集雨水

Given n non-negative integers a1, a2, …, an, where each represents a point at coordinate (i, ai).…

## [LeetCode] Champagne Tower 香槟塔

We stack glasses in a pyramid, where the first row has 1 glass, the second row has 2 glasses, and so on…