H. Degenerate Matrix Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/549/problem/H Description The determinant of a matrix 2 × 2 is defined as follows: A matrix is called degenerate if its determinant is equal to zero. The…

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…

#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…

下面是题解,做的不好.下一步的目标是rating涨到 1800,没打过几次cf A. Face Detection Author: Monyura One should iterate through each 2x2 square and check if it is possible to rearrange letters in such way they they form the word "face". It could be done i.e. by sorting al…

A题水 C题 博弈论,如果不是CF有WA具体哪个点错了和数据的话,AC要难许多. 如果D的操作数大于奇数个数直接Win 偶数个数大于等于n – k 时,S直接Win 偶数个数小于n – k时,若D操作数大于等于偶数个数,则输入拿掉所有偶数后最后剩下的奇数个数,剩奇数个则S,否则D 偶数个数小于n-k是,若D操作数小于偶数个数,则看S和D的操作数是否一致,是则D,否则S. D题水题 从右下角左上角更新就可以了 H题 数学带一点几何 把A,B矩阵的两行分别看成两个坐标,B是退化矩阵的充要条件是上下两…

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…

F - Yura and Developers 第一次知道单调栈搞出来的区间也能启发式合并... 你把它想想成一个树的形式, 可以发现确实可以启发式合并. #include<bits/stdc++.h> #define LL long long #define fi first #define se second #define mk make_pair #define PII pair<int, int> #define PLI pair<LL, int> #defi…

题目链接:http://codeforces.com/problemset/problem/549/C C. The Game Of Parity time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output There are n cities in Westeros. The i-th city is inhabited by ai pe…

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…