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Let's start with sequence traversal. This is a common problem. Print it according to each layer, as follows: For Recommendation in Deep learning QQ Group 277356808 For deep learning QQ Second Group 629530787 I'm here waiting for you 1 - sequence traversal and deformation Sequence traversal is the most intuitive and simplest sequence, that ...

Longest double palindrome string Title Link: ybt gold navigation 2-1-3 / luogu P4555 General idea of the topic Give you a string and ask you to find the longest substring so that it is composed of two palindrome strings. thinking First, let's see the palindrome string. Let's run a Manacher first. Then we'll think about what to do. First, ...

Topic Title Link: https://www.luogu.com.cn/problem/P6775 General idea of the topic n n n raw materials, No i i i have d ...

Title Link https://codeforces.com/problemset/problem/149/D meaning of the title Give a matching bracket string. Each bracket can be dyed a and b or not. Requirements: Each matching bracket needs to have and only one coloringAdjacent brackets shall not be dyed in the same color, but neither Number of dyeing schemes thinking Note that we a ...

preface Review the content of the basic course of acwing algorithm. This article is to explain the basic algorithm: dynamic programming - digital statistics DP. About time complexity: bloggers are not very good at computing at present. They will make up for it in the future. 1, Dynamic programming Dynamic Programming (DP) is the proc ...

Recommend 2 Blogs: Slope optimization DP detailed explanation - Zhihu Slope optimization OI Wiki Example 1: P5785 [SDOI2012] task arrangement First, we can define violence dp f [ i ] [ j ...

1, Title Click here to see the question There is a grid diagram of \ (2\times n \), and there are \ (m_1+m_2 \) obstacles in the upper and lower lines respectively. Now you drive the tank from \ ((1,0) \) to \ ((1,n+1) \) or \ ((2,n+1) \), you can choose whether to wrap the line every second (the column remains unchanged), then choose whether t ...

A. Solving equation It is easy to do without considering the two restrictions. Use the board inserting method to divide \ (m \) balls into \ (n \) piles It's \ (\ binom{m-1}{n-1} \) The second limit is greater than or equal to, so you can allocate \ (a_i-1 \) to these numbers first The first restriction is not easy to do directly, so consider i ...

AcWing 902. Minimum edit distance Given the two strings A and B, now you want to change A into B through several operations. The available operations are: Delete – deletes A character from string A. Insert – inserts A character somewhere in string A. Replace – replaces one character in string A with another. Now please find ...

Gossip: I guessed a conclusion when I was doing this problem. The number of longest ascending subsequences cannot exceed two. At that time, I felt it was false... First of all, if a sequence can satisfy the lower bound, then each element in it must only move in the direction of its target. In addition, the movement of a number is determined by ...