题目链接:Codeforces 460E Roland and Rose 题目大意:在以原点为圆心,半径为R的局域内选择N个整数点,使得N个点中两两距离的平方和最大. 解题思路:R最大为30.那么事实上距离圆心距离最大的整数点只是12个最多,直接暴力枚举. #include <cstdio> #include <cstring> #include <vector> #include <algorithm> using namespace std; struc…

本以为是个树形DP,按照树形DP的方法在那里dfs,结果WA到死,因为它存在有向环,不是树,凡是存在环的情况切记不要用树形的方法去做 题目的突破点在于将边排完序之后,用点表示以该点为边结尾的最大长度,因为是按边排序从小到大加边,所以后面加的边肯定比前面的小. 要注意相同边的情况,要搞个缓冲,因为相同边的时候如果直接操作,可能会造成不应该有的影响. #include <iostream> #include <cstdio> #include <cstring> #incl…

E. Roland and Rose Time Limit: 1 Sec  Memory Limit: 256 MB 题目连接 http://codeforces.com/problemset/problem/460/E Description Roland loves growing flowers. He has recently grown a beautiful rose at point (0, 0) of the Cartesian coordinate system. The ro…

Hidden Code 题目连接: http://codeforces.com/gym/100015/attachments Description It's time to put your hacking skills to the test! You've been called upon to help crack enemy codes in the current war on... something or another. Anyway, the point is that yo…

A. ArielTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100685/problem/A Description King Triton really likes watching sport competitions on TV. But much more Triton likes watching live competitions. So Triton decides to set up…

G. #TheDress Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100637/problem/G Description After landing on planet i1c5l people noticed that blue and black clothes are quite popular among the locals. Each aboriginal has at least…

Couple Cover Time Limit: 3000MS   Memory Limit: 524288KB   64bit IO Format: %I64d & %I64u Description 方宝宝有n个篮球,每个篮球上写有一个值ai.他第一次从n个篮球中取出1个,不放回.第二次再在剩余的篮球中取出一个. (每个球被取概率相同).如果这两个球上的值的乘积大于等于p,他会变得高兴,然后请大家吃饭.否则方宝宝会不高兴, 然后暴食暴饮变得更胖. 当然为了方宝宝的健康(被请吃饭),我想取一个…

D. Jerry's Protest time limit per test:2 seconds memory limit per test:256 megabytes input:standard input output:standard output Andrew and Jerry are playing a game with Harry as the scorekeeper. The game consists of three rounds. In each round, Andr…

La Vie en rose 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5745 Description Professor Zhang would like to solve the multiple pattern matching problem, but he only has only one pattern string p=p1p2...pm. So, he wants to generate as many as possib…

题目链接: http://codeforces.com/contest/651/problem/D D. Image Preview time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Vasya's telephone contains n photos. Photo number 1 is currently opened on…