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Firstly, a chair tree is used to find the board with the smallest interval K. #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #define mid (l+r)/2 using namespace std; const int N = 1e6+4; int L[N<<5],R[N<<5],sum[N<<5]; int a[N],b[N],T[N ...

Give you two strings S and t consisting of numbers (character'0'SIM' 9'). The length of S is n, and the length of T is m. The first character of S and t is not'0'. If considered a positive integer, count the number of valid subsequences of s greater than t. The subsequence is valid only if and only ...

Portal Idea: The way to find a matching set is greed. For edges (u,v), if u and V are not covered by other edges already in the set, then add edges (u,v) to the set, and finally determine whether the number of edges in the set is greater than or equal to n. If it is greater than or equal to n, it ca ...

Linux directory structure Linux directory structure is a tree-like directory structure root directory The starting point of all partitions, directories, files, etc. In the entire tree directory structure, a separate "/" is used. Common subdirectories Catalog Directory name Catalog Directory name /root Administrator's Home Direc ...

1. Overview of single linked list The linked list is stored in the way of nodes, it is chain storage. Each node contains a data domain, next domain: point to the next node. The nodes of the linked list are not necessarily consecutive storage The linked list with sub-header nodes and the linked l ...

1. Binary search tree (two conditions): (1) There are at most two sub-nodes in the binary tree: one is the left node, the other is the right sub-node.(2) Only values smaller than the parent node are allowed to be stored in the left node, while values larger (or equal to) are allowed in the right node. 2. Code Architecture: It mainly includes in ...

css media query has a aspect-ratio, which can be used directly for page adaptation. // Width-to-height ratio is within ((320/50)+(728/90)/2 of the median of two sizes to fit 320*50 design pattern. @media screen and (min-aspect-ratio: ~"249/50") and (max-aspect-ratio: ~"29/4"){ @base: 320; @convert: 375/@base; .c ...

Conditional logic Conditionally render some elements, using the "if" code block: <script> let user = { loggedIn: true }; function toggle() { user.loggedIn = !user.loggedIn; } </script> {#if user.loggedIn} <button on:click={toggle}> Log out </button> {/if} Using else code bl ...

Topic link: https://cn.vjudge.net/contest/317394#problem/A Judging whether two sequences are the same binary search tree sequence Input Beginning with a number n, (1 <= n <= 20) means there are n judgements to be made, and the input ends when n= 0. The next line is a sequence with a length less th ...

In MySQL's official manual, about Introduction to index merge Very few. There are even many misleading places. This time, I have looked over the code of version 5.1 about this kind of optimization processing, and introduced various practical index merge access types of SQL in a case-by-case way. Subsequently, we will continue to introduce the m ...