一道纯粹的容斥原理题!!不过有一个trick,就是会出现重复的,害我WA了几次!! 代码: #include<iostream> #include<cstdio> #include<cmath> #include<algorithm> #include<cstring> #include<set> #include<vector> #define ll long long #define mod 55566677 usin…

The Review Plan I Time Limit: 5000ms Memory Limit: 65536KB This problem will be judged on ZJU. Original ID: 368764-bit integer IO format: %lld      Java class name: Main   Michael takes the Discrete Mathematics course in this semester. Now it's close…

The Review Plan I Time Limit: 5 Seconds      Memory Limit: 65536 KB Michael takes the Discrete Mathematics course in this semester. Now it's close to the final exam, and he wants to take a complete review of this course. The whole book he needs to re…

The Review Plan I Time Limit: 5000ms Case Time Limit: 5000ms Memory Limit: 65536KB   64-bit integer IO format: %lld      Java class name: Main Michael takes the Discrete Mathematics course in this semester. Now it's close to the final exam, and he wa…

GCD Expectation Time Limit: 4 Seconds                                     Memory Limit: 262144 KB                             Edward has a set of n integers {a1, a2,...,an}. He randomly picks a nonempty subset {x1, x2,…,xm} (each nonempty subset has…

Description Edward has a set of n integers {a1, a2,...,an}. He randomly picks a nonempty subset {x1, x2,…,xm} (each nonempty subset has equal probability to be picked), and would like to know the expectation of [gcd(x1, x2,…,xm)]k. Note that gcd(x1, …

赤裸的带禁区的排列数,不过,难点在于如何用程序来写这个公式了.纠结了好久没想到,看了看别人的博客,用了DFS,实在妙极,比自己最初想用枚举的笨方法高明许多啊.\ http://blog.csdn.net/hlmfjkqaz/article/details/11037821 自己理解那个DFS后自己敲的.. #include <iostream> #include <cstdio> #include <cstring> #include <algorithm>…

REMEMBER US. haruka是可爱的孩子. 如题,此博客用来记录我停课后的日常. Dear Diary 10.8 上午考试. T1,直接枚举每一个点最后一次被修改的情况.(100pts) T2,有一个递推式,但由于数据较大,需要用矩阵快速幂来优化.(20pts 已改) T3,看出来了是最短路+0/1分数规划,但是因为考试策略的问题,导致没有时间深入思考.(0pts 未改) To Solve List: 1.对拍不熟练. 2.学习矩阵快速幂.(Solved) 3.复习0/1分数规划. 4…

主题链接: http://acm.zju.edu.cn/onlinejudge/showProblem.do? problemId=4535 How Many Sets I Time Limit: 2 Seconds      Memory Limit: 65536 KB Give a set S, |S| = n, then how many ordered set group (S1, S2, ..., Sk) satisfies S1 ∩ S2 ∩ ... ∩ Sk = ∅. (Si is…

这题被出题人给活活坑了,题目居然理解错了..哎,不想多说. 题意:给两组数,A组为幸运基数,B组为不幸运的基数,问在[low,high]区间内有多少个数:至少被A组中一个数整除,并且不被B中任意一个数整除.|A|<=15. 分析:看到A长度这么小,以及求区间内满足条件的个数问题,容易想到容斥原理,因为不被B中任意一个数整除,所以将B数组所有数取一个最小公倍数LCM,那么就变成了幸运数字都不会被这个LCM整除. 然后枚举子集,实现要将A中元素去除相互整除的情况,比如A = [2,4],这时因为被至…