Codeforces886(Technocup2018) F Symmetric Projections You are given a set of n points on the plane. A line containing the origin is called good, if projection of the given set to this line forms a symmetric multiset of points. Find the total number of…

题意:给你平面上n个点,问有多少条过原点的直线,使得这些点在该直线上的投影(做垂直,对应点)形成对称图形?n<=2000. 标程: #include<bits/stdc++.h> #define P pair<int,int> using namespace std; const int inf=0x3f3f3f3f; ; ; struct node{double x,y,k;int px,py;}a[N*N]; double mid_x,mid_y; int n,x[N],…

ACM ICPC 每个队伍必须是3个人 #include<stdio.h> #include<string.h> #include<stdlib.h> #include<vector> #include<algorithm> using namespace std; int cmp(const void * x, const void * y) { //x < y : -; } ]; int main() { #ifndef ONLINE_…

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题目链接:http://www.patest.cn/contests/pat-a-practise/1040 题目: 1040. Longest Symmetric String (25) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Given a string, you are supposed to output the length of the longest symmetric sub-stri…

链接:https://www.nowcoder.com/acm/contest/142/F来源:牛客网 题目描述 There's a beautiful garden whose size is n x m in Chiaki's house. The garden can be partitioned into n x m equal-sized square chunks. There are some kinds of flowers planted in each square chun…

Fisheye projections from spherical maps Written by Paul Bourke May 2003, software updated January 2016 See also: Mapping a equirectangular projection to perspective The source code implementing the projections below is only available on request for a…

F. Magic Matrix 题目连接: http://www.codeforces.com/contest/632/problem/F Description You're given a matrix A of size n × n. Let's call the matrix with nonnegative elements magic if it is symmetric (so aij = aji), aii = 0 and aij ≤ max(aik, ajk) for all…

题目: F Beautiful Garden 题目描述 There's a beautiful garden whose size is n x m in Chiaki's house. The garden can be partitioned into n x m equal-sized square chunks. There are some kinds of flowers planted in each square chunk which can be represented by…

1040. Longest Symmetric String (25) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Given a string, you are supposed to output the length of the longest symmetric sub-string. For example, given "Is PAT&TAP symmetric?", th…