Given a non-negative integer c, your task is to decide whether there’re two integers a&…

  A website domain like “discuss.leetcode.com” consists of various subdomains. At the top lev…

Peeking Iterator Given an Iterator class interface with methods: next() and hasNext(), design and implement a …

Minimum Window Substring Given a string S and a string T, find the minimum window in S which will contain all …

226. Invert Binary Tree 题目: https://leetcode.com/problems/invert-binary-tree/ 难度: Easy class Solution(object):…

题目地址：https://leetcode.com/problems/flipping-an-image/description/ 大意：两次反转二元矩阵，第一次将子元素序列倒置，第二次将子元素的子元素0变1,1变0。所…

这是悦乐书的第194次更新，第200篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第56题（顺位题号是231）。给定一个整数，写一个函数来确定它是否是2的幂。例如： 输入：1 输出：true…

这是悦乐书的第248次更新，第261篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第115题（顺位题号是506）。根据N名运动员的得分，找到他们的相对等级和得分最高的三个人，他们将获得奖牌：…

欢迎fork and star：Nowcoder-Repository-github 134. Gas Station 题目 There are N gas stations along a circular route…

题目： Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 思路： 自顶向下…

题目描述 Given an array of n integers where n > 1, nums, return an array output such that output[i] is equal to…

Problem More Discussions Given an array of integers, find how many pairs in the array such that their sum is b…