题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5738 题目大意:给定平面上的n个点,一个集合合法当且仅当集合中存在一对点u,v,对于集合中任意点w,均有dis(u,v)≥[dis(u,v)+dis(u,w)+dis(v,w)]/2.其中dis(A,B)为A,B两点的欧几里得距离.问你这样的合法集合有多少个.数据范围:1≤n≤1000. 解题思路:对于所给条件简单分析一下就能转化题意,实际上是在求有多少个集合满足集合内的点都在同一直线上. 比赛时的…

2016 Al-Baath University Training Camp Contest-1 A题:http://codeforces.com/gym/101028/problem/A 题意:比赛初始值是1500,变化了几次,得到的正确结果和bug后的是否相等.(Tourist大佬好 Y(^o^)Y) #include <bits/stdc++.h> using namespace std; int main() { int t; cin>>t; while(t--) { in…

Stupid Tower Defense Time Limit: 12000/6000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others) Total Submission(s): 151    Accepted Submission(s): 32 Problem Description    FSF is addicted to a stupid tower defense game. The goal of towe…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5738 题目大意:给定平面上的n个点,一个集合合法当且仅当集合中存在一对点u,v,对于集合中任意点w,均有dis(u,v)≥[dis(u,v)+dis(u,w)+dis(v,w)]/2.其中dis(A,B)为A,B两点的欧几里得距离(?).问你这样的合法集合有多少个.数据范围:1≤n≤1000. 提示:可能出现多个同样的点,我们称之为重点. 容易得到:n个点(其中有cnt个重复的p点)共线,可构成的集…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5768 题目大意:给你区间[L,R],问你[L, R]中有多少个数字x满足x%7=0且x%p[i]≠a[i]; 数据范围:1≤L<R≤10^18,0<a[i]<p[i]≤10^5,p[i],a[i]有n对,0≤n≤15: 解题思路:这道题赛场上想到了正解,但是因为一些细节处理上经验不足导致WA到结束(对拍都能过,大数处理的问题) 首先看到所求的条件像是求几个集合的并,而n范围恰好合乎容斥范围,…

Description ACM-SCPC-2017 is approaching every university is trying to do its best in order to be the Champion, there are n universities, the ith of them has exactly ai contestants. No one knows what is the official number of contestants in each team…

Description Tourist likes competitive programming and he has his own Codeforces account. He participated in lots of Codeforces Rounds, solved so many problems and became "Legendary Grand Master" (the highest rank on Codeforces). One day, he logg…

Description X is fighting beasts in the forest, in order to have a better chance to survive he's gonna buy upgrades for his weapon. Weapon upgrade shops are available along the forest, there are n shops, where the ith of them provides an upgrade with…

Description It is raining again! Youssef really forgot that there is a chance of rain in March, so he didn't fix the roof of his house. Youssef's roof is 1-D, and it contains n holes that make the water flow into the house, the position of hole i is…

 Description You've possibly heard about 'The Endless River'. However, if not, we are introducing it to you. The Endless River is a river in Cambridge on which David and Roger used to sail. This river has the shape of a circular ring, so if you kept…