题目链接：https://leetcode.com/problems/longest-palindromic-substring/ 题目难度：Medium 题目描述： Given a string s, find the…

这是悦乐书的第172次更新，第174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31题（顺位题号是121）。假设有一个数组，其中第i个元素是第i天给定股票的价格。如果只被允许完成最多一笔…

My code: public class Solution { public boolean validWordAbbreviation(String word, String abbr) { int wi = 0; …

  Write a SQL query to find all numbers that appear at least three times consecutively. +----+-----+ | Id…

题目： Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substring…

Find Intersection of Two Sets 暴力法 复杂度 时间 O(NM) 空间 O(1) 思路 暴力解法，对于每个在集合1中的元素，我们遍历一遍集合2看看是否存在，如果存在则是Intersection…

Reverse Words in a String Given an input string, reverse the string word by word. For example, Given s = ̶…

题目 Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999.…

  Given an m x n matrix of non-negative integers representing the height of each unit cell in a continent…

  Given a sorted array, two integers k and x, find the k closest elements to&nbs…

题目地址：https://leetcode-cn.com/probl…题目描述：给定一个可包含重复数字的序列，返回所有不重复的全排列。 示例: 输入: [1,1,2]输出:[ [1,1,2], [1,2,1]…

Problem Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from let…