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⭐ Introduction ⭐ ️ Hello, everyone. I'm an executive. Today we bring you a set of special training on string processing. No matter you are studying or working, you must have a lot of contact with string. If you deal with string at ordinary times, you must use library functions directly. After all, there are many library functions for strings. ...

[Title Description] Force bucklehttps://leetcode-cn.com/problems/maximum-employees-to-be-invited-to-a-meeting/ A company is going to organize a meeting with n# employees on the invitation list. The company has prepared a round table for any number of employees. Employee numbers are 0} to n - 1. Each employee has an employee who likes ， and ...

📢 preface 🚀 Algorithm problem 🚀 🌲 Punching out an algorithm problem every day is not only a learning process, but also a sharing process 😜🌲 Tip: the problem-solving programming languages in this column are C# and Java🌲 To maintain a state of learning every day, let's work together to become the great God of algorithm ...

Introduction to merge sort Algorithm idea: The core idea of merge sort is to use divide and conquer strategy to classify the sort task of the whole array into two sub problems, the first half sort and the second half sort, and then integrate the two ordered parts to complete the overall sort. That is, the array is divided into several subsequ ...

511. Game play analysis I Activity table: +--------------+---------+ | Column Name | Type | +--------------+---------+ | player_id | int | | device_id | int | | event_date | date | | games_played | int | +--------------+---------+ The primary key of the table is (player_id, event_date). This table shows the behavi ...

Given the head of a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. Return the linked list sorted as well. Example 1: Input: head = [1,2,3,3,4,4,5] Output: [1,2,5] Example 2: Input: head = [1,1,1,2,3] Output: [2,3] Constraints: The number of nodes in the lis ...

introduction These two questions are mainly to investigate the mastery of binary tree traversal, that is, the original binary tree is derived from the front order and middle order, and the original binary tree is derived from the back order and middle order. Let's talk about the derivation process first; Preorder and middle order Know the preo ...

subject This is [034, modified phrase] on LeetCode. The difficulty is [simple] Some alien languages also use English lowercase letters, but the order may be different. The order of the alphabet is the arrangement of lowercase letters. Given a set of words written in an alien language and the order of its alphabet, it returns true only wh ...

350. Intersection of two arrays II Given two arrays, write a function to calculate their intersection. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2,2] Output: [2,2] Example 2: Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4] Output: [4,9]   explain: The number of occurrences of each element in the output result shall be consistent with the m ...

1. Algorithm 1.1 dynamic planning 1.1. 1 simple topic 53. Maximum subsequence sum Given an integer array nums, find a continuous sub array with the largest sum (the sub array contains at least one element) and return its maximum sum. Method 1 /* Use f(i) to represent the "maximum sum of continuous subarrays" ending with the ...