B. Looksery Party time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output The Looksery company, consisting of n staff members, is planning another big party. Every employee has his phone number and…

Looksery Party Solution: 仔细分析一下会发现每个人都会发一条消息给自己这个条件非常重要! 这个条件保证了一定会有解,而且解法也要从这里入手. 当我们拿到一个猜测的答案序列的时候,假设这个序列没有0,那我们一个人都不需要邀请. 存在0的时候先邀请答案是0的人,然后对在它联系人列表的人的答案进行减一操作,这样操作之后可能会让一些数减小到0,但是因为每个人能联系自己,必然可以将所有的0减掉,所以必然存在解.只要把我们选择的人记录下来就好. #include <bits/stdc…

题面 解题思路 如果a数组全部>0,那么都不去即可.从这个角度出发,每次选出a[i]为0的,让它们去更新a数组,相当于拓补排序. 代码 #include<iostream> #include<cstdio> #include<cstring> #include<queue> using namespace std; const int MAXN = 105; int n,a[MAXN][MAXN],re[MAXN]; int cnt,ans[MAXN]…

The determinant of a matrix 2 × 2 is defined as follows: A matrix is called degenerate if its determinant is equal to zero. The norm ||A|| of a matrix A is defined as a maximum of absolute values of its elements. You are given a matrix . Consider any…

The first algorithm for detecting a face on the image working in realtime was developed by Paul Viola and Michael Jones in 2001. A part of the algorithm is a procedure that computes Haar features. As part of this task, we consider a simplified model…

#include <cstdio> #include <cstring> #include <algorithm> #include <string> #include <cmath> #include <iostream> using namespace std; bool fun(double l1,double r1,double l2,double r2){ return (l1 <= r2 && l1…

There are n cities in Westeros. The i-th city is inhabited by ai people. Daenerys and Stannis play the following game: in one single move, a player chooses a certain town and burns it to the ground. Thus all its residents, sadly, die. Stannis starts…

A. Face Detection Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/549/problem/A Description The developers of Looksery have to write an efficient algorithm that detects faces on a picture. Unfortunately, they are currently…

B. Looksery Party Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/549/problem/B Description The Looksery company, consisting of n staff members, is planning another big party. Every employee has his phone number and the pho…

上一次我们拿学校的URP做了个小小的demo.... 其实我们还可以把每个学生的证件照爬下来做成一个证件照校花校草评比 另外也可以写一个物理实验自动选课... 但是出于多种原因,,还是绕开这些敏感话题.. 今天,我们来扒一下cf的题面! PS:本代码不是我原创 1. 必要的分析 1.1 页面的获取 一般情况CF的每一个 contest 是这样的: 对应的URL是:http://codeforces.com/contest/xxx 还有一个Complete problemset页面,它是这样的:…