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1,LeetCode 344. Reverse string subject Write a function that inverts the input string. The input string is given in the form of character array char []. Do not allocate additional space to another array. You must modify the input array in place and use the additional space of O(1) to solve this problem. You can assume that all char ...

LeetCode brush question array 1, Array 1.1 definition of array An array is a collection of several objects with a certain order. The objects that make up the array are called array elements. Where the vector corresponds to a one-dimensional array and the matrix corresponds to a two-dimensional array. 1.2 storage characteristics of array Ar ...

📒 Blog home page: A professional who advocates learning technology 🍣 Today's article is "game 280 of LeetCode" 🍣 🍣 I hope you can finish reading this article patiently 🍣 🙏 Bloggers are also in the learning stage. If you find any problems, please let us know. Thank you very much 🙏 💗 At the same time, thank you very much for you ...

Xiaobian has something to say: these topics are the understanding and application of the recursive traversal structure of binary tree, which are very classic topics. After doing a few steps, you will feel that at present, you can't run away from all the problems. Recursion is just to deal with the current node - it may be to do some oper ...

Day 35 I use C + +, please forgive me for the mistakes. The original intention of this article is only to urge me to study. If I happen to be able to help you, I will be very happy. 1, 1143 Longest common subsequence Give you an integer array of coins to represent coins of different denominations; And an integer amount, representing the t ...

Substring selection / String Journey Title Link: YBT2022 winter vacation Day6 C / luogu CF1063F General idea of the topic Give you a string. If you want to find the maximum K satisfaction, you can choose k disjoint substrings from left to right at a time to meet that the former is the real substring of the latter. thinking First of all, le ...

177. Convert the sorted array into a binary search tree with the lowest height Give a sort array (from small to large) and convert it into a binary search tree with the smallest height. class Solution: """ @param: A: an integer array @return: A tree node """ def sortedArrayToBST(self, A): # write your code her ...

LC031. Next Permutation 1, Title An arrangement of an integer array is to arrange all its members in sequence or linear order. For example, arr = [1,2,3], the following can be regarded as the arrangement of arr: [1,2,3], [1,3,2], [3,1,2], [2,3,1]. The next permutation of an array of integers refers to the next lexicographically ordered pe ...

preface When I first know LeetCode and algorithm, I will record my algorithm learning experience in this series of articles. In the early stage, I mainly supervise my learning and clock in. In the later stage, I will slowly add my understanding of knowledge to the articles. I hope you can gain something from reading my articles. The order ...

Code Capriccio record brush problem introduction notes Code Capriccio introduction Code Capriccio record brush problem introduction notes 1. You should know this about binary tree! Handout address Binary tree code public class TreeNode { int val; TreeNode left; TreeNode right; TreeNode() { } TreeNode(int val) ...