Check whether the original sequence org can be uniquely reconstructed from the sequences in seqs. The o…

Swap Nodes in Pairs Given a linked list, swap every two adjacent nodes and return its head. For example, Given…

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

Palindrome Number Determine whether an integer is a palindrome. Do this without extra space. 反转比较法 Reverse and…

1. 题目 Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest …

题目链接https://oj.leetcode.com/problems/simplify-path/ Description Given an absolute path for a file (Unix-style)…

题目描述： Given a non-empty array of non-negative integers nums, the degree of this array is defined as the maximu…

You need to construct a binary tree from a string consisting of parenthesis and integers. The whole input repr…

  Given an array where elements are sorted in ascending order, convert it to a height balanced BST. For t…

There are a total of n courses you have to take, labeled from 0 to n-1. Some courses may have prerequisites, f…

Merge Intervals 最新更新请见 https://yanjia.me/zh/2019/02/… Given a collection of intervals, merge all overlap…

225. Implement Stack using Queues 题目: https://leetcode.com/problems/implement-stack-using-queues/ 难度: Easy 又到了…