这是悦乐书的第252次更新，第265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119题（顺位题号是521）。给定一组两个字符串，您需要找到这组两个字符串中最长的不同子序列。最长的不同子…

Problem Given a string s consists of upper/lower-case alphabets and empty space characters ‘ ‘, re…

  Given a picture consisting of black and white pixels, find the number of black lonely pixels.…

题目： Sort a linked list in  O ( n  log  n ) time using constant space complexity. 思路： 合并排序法。 代码：…

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

242. Valid Anagram 题目： https://leetcode.com/problems/valid-anagram/ 难度 : Easy 对Python来说，又是一块蛋糕，不本地测试 就是这么自信 cl…

题目描述 操作给定的二叉树，将其变换为源二叉树的镜像。 输入描述: 二叉树的镜像定义： 源二叉树 8 / \ 6 10 / \ / \ 5 7 9 11 镜像二叉树 8 / \ 10 6 / \ / \ 11 9 7 5…

  Given a m x n grid filled with non-negative numbers, find a path from top left to b…

  Suppose LeetCode will start its IPO soon. In order to sell a good price of its shares to Venture Capita…

  You are given coins of different denominations and a total amount of money. Write a function to compute…

  Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowerc…

1 题目描述 Given an array S of n integers, find three integers in S such that the sum is closest to a given number…