Description Georgia and Bob decide to play a self-invented game. They draw a row of grids on paper, number the grids from left to right by 1, 2, 3, ..., and place N chessmen on different grids, as shown in the following figure for example: Georgia an…
[题目] ExponentiationTime Limit: 500MS Memory Limit: 10000KTotal Submissions: 123707 Accepted: 30202Description Problems involving the computation of exact values of very large magnitude and precision are common. For example, the computation of the nat…
网络流/二分图最小点权覆盖 sigh……这题……TLE&RE了好几发 建一个二分图,左边的每个结点代表行,右边的代表列,如果在(i,j)这个位置有一个外星人,那么我们就连一条边 (左 i ->右 j),这样的话,求一个二分图最小点权覆盖即可. 为什么这样建图是对的?大家学过二分图应该知道点覆盖是啥吧……(至少学过最小点覆盖=最大匹配吧?)那么我们选了某一个点,比如我们选了左边的第 i 个点,这就表示我们在第 i 行建了一座激光炮,它能打到的外星人就是这个点连出去的所有边!也就是说对于每个外星…
Feel Good Time Limit: 3000MS Memory Limit: 65536K Total Submissions: 18449 Accepted: 5125 Case Time Limit: 1000MS Special Judge Description Bill is developing a new mathematical theory for human emotions. His recent investigations are dedicated…
http://poj.org/problem?id=3243 题意:求$a^y \equiv b \pmod{p}$最小的$y$.(0<=x, y, p<=10^9) #include <cstdio> #include <cstring> #include <algorithm> #include <cmath> #include <iostream> typedef long long ll; using namespace st…
http://poj.org/problem?id=2151 题意:T个队伍M条题目,给出每个队伍i的每题能ac的概率p[i][j],求所有队伍至少A掉1题且冠军至少A掉N题的概率(T<=1000, M<=30) #include <cstdio> #include <cstring> using namespace std; const int T=1005, M=35; double d[T][M], p[T][M]; int n, m, N; void clr()…