poj——2239   Selecting Courses Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 10656   Accepted: 4814 Description It is well known that it is not easy to select courses in the college, for there is usually conflict among the time of the c…

Selecting Courses Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8316   Accepted: 3687 Description It is well known that it is not easy to select courses in the college, for there is usually conflict among the time of the courses. Li Mi…

题目地址:http://poj.org/problem?id=2239 Li Ming大学选课,每天12节课,每周7天,每种同样的课可能有多节分布在不同天的不同节.问Li Ming最多可以选多少节课.把n种课划分为X集合,把一周的84节课划分为Y集合, 从Xi向Yi连边,那么就转化成了求二分图的最大匹配数,然后匈牙利算法就可以了. #include<cstdio> #include<iostream> #include<string.h> #include<alg…

http://poj.org/problem?id=2239 这里要处理的是构图问题p (1 <= p <= 7), q (1 <= q <= 12)分别表示第i门课在一周的第p天的第q节课上 其中二分图的X集合里表示课程i,那么我们要解决的就是Y集合了 将第i门课在一周的第p天的第q节课上进行编号,这样Y集合就是 上课时间的编号了 #include<stdio.h> #include<string.h> #include<math.h> #in…

二分图的最大匹配.课程和时间可以看做二分图. #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> using namespace std; ; int nx,ny; int g[MAXN][MAXN]; int cx[MAXN],cy[MAXN]; int mk[MAXN]; int n; ]; int path(int u) { ; v<ny; v++) { i…

Selecting Courses Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9380   Accepted: 4177 Description It is well known that it is not easy to select courses in the college, for there is usually conflict among the time of the courses. Li Mi…

题意: 一个学生要选课,给出一系列课程的可选时间(按分钟计),在同一时刻只能选一门课程(精确的),每隔5分钟才能选一次课,也就是说,从你第一次开始选课起,每过5分钟,要么选课,要么不选,不能隔6分钟再选.在给出的课程的事件Ai~Bi内,Bi起的那分钟是不能够选的了,就是说截止到(Bi-1)分钟59秒还能选,Bi就不能选了. 思路: 由于n最大才300,那就可以使用暴力解法.开始时刻可以从0~4分钟这5个时刻开始,因为每5分钟是个周期,比如0分没选,而5分才选了,这和从5分才开始选是一样的.每隔5…

1.poj 2239   Selecting Courses   二分图最大匹配问题 2.总结:看到一个题解,直接用三维数组做的,很巧妙,很暴力.. 题意:N种课,给出时间,每种课在星期几的第几节课上,求最多可上几种课. #include<iostream> #include<cstring> #include<cstdio> using namespace std; ][][]; ][],pipei[][]; int findn(int n) { ;i<=;i+…

题目链接:pid=3697" target="_blank">http://acm.hdu.edu.cn/showproblem.php?pid=3697 Problem Description     A new Semester is coming and students are troubling for selecting courses. Students select their course on the web course system. There…

Description     A new Semester is coming and students are troubling for selecting courses. Students select their course on the web course system. There are n courses, the ith course is available during the time interval (Ai,Bi). That means, if you wa…