题目大意:是有M个猪圈,N个顾客,顾客要买猪,神奇的是顾客有一些猪圈的钥匙而主人MIRKO却没有钥匙,多么神奇?顾客可以在打开的猪圈购买任意数量的猪,只要猪圈里有足够数量的猪.而且当顾客打开猪圈后mirko就可以在打开的猪圈之间任意调整猪的数量,(顾客走了之后猪圈要关闭).问mirko怎样做能使顾客买到最多的猪 思路如下:(也是查的,具体原理和原因明天更新) 1.取超级源点和超级汇点: 2.当猪圈被第一次打开时,在源点与当前顾客之间连接一条边,容量为该猪圈的猪的头数: 3.当某个猪圈 不是被第一…

PIGS Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 20738   Accepted: 9481 Description Mirko works on a pig farm that consists of M locked pig-houses and Mirko can't unlock any pighouse because he doesn't have the keys. Customers come t…

PIGS Time Limit: 1000ms Memory Limit: 10000KB This problem will be judged on PKU. 64-bit integer(整数) IO format: %lld      Java class name: Main   Mirko works on a pig farm that consists of M locked pig-houses and Mirko can't unlock any pighouse becau…

Time Limit: 1000MS Memory Limit: 10000K Description Mirko works on a pig farm that consists of M locked pig-houses and Mirko can't unlock any pighouse because he doesn't have the keys. Customers come to the farm one after another. Each of them has ke…

PIGS Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 18727   Accepted: 8508 Description Mirko works on a pig farm that consists of M locked pig-houses and Mirko can't unlock any pighouse because he doesn't have the keys. Customers come t…

Description Mirko works on a pig farm that consists of M locked pig-houses and Mirko can't unlock any pighouse because he doesn't have the keys. Customers come to the farm one after another. Each of them has keys to some pig-houses and wants to buy a…

题意: 你m个猪圈以及每个猪圈里原来有多少头猪,先后给你n个人,每个人能打开某一些猪圈并且他们最多想买Ki头猪,在每一个人买完后能将打开的猪圈中的猪顺意分配在这次打开猪圈里,在下一个人来之前 已打开的猪圈会被锁上.问最多能卖几头猪 分析: 这个题明着想呢,肯定是要建N排点的,表示相同的猪圈的点连inf边,跑最大流的. 建那么多点肯定是会炸的. 在网络流中呢,如果我们做题的初步思路是最大流,那么肯定要将题目中问的直接问题抽象成水流,比如这道题,问最多的卖猪数,我们当然就要把猪的数量作为“流”,这是…

PIGS Description Mirko works on a pig farm that consists of M locked pig-houses and Mirko can't unlock any pighouse because he doesn't have the keys. Customers come to the farm one after another. Each of them has keys to some pig-houses and wants to…

题意: m n   //有m个猪圈,n个人卖猪. a1...am    //编号为i的猪圈里有ai头猪. b1 c1...cb1 d1   //第i个人有bi把钥匙,分别是ci猪圈的,其它猪圈里的猪都是锁着的   他最多买di头猪 . . . bn c1...cbn dn 注意的是假如某买主有第一和第二个猪圈的钥匙,那么他买完猪以后这两个猪圈的个数我们可以随意调整,调整完将猪圈锁上. 求:最多能卖多少猪 思路: 源点到每个猪圈建边,容量为这个猪圈的猪的数量,然后买主与他有钥匙的猪圈建边,容量in…

[题意] 有M个猪圈,每个猪圈里初始时有若干头猪.一开始所有猪圈都是关闭的.依 次来了N个顾客,每个顾客分别会打开指定的几个猪圈,从中买若干头猪.每 个顾客分别都有他能够买的数量的上限.每个顾客走后,他打开的那些猪圈中的 猪,都可以被任意地调换到其它开着的猪圈里,然后所有猪圈重新关上.问总共 最多能卖出多少头猪.(1 <= N <= 100, 1 <= M <= 1000) 非常好的一道网络流建模题!最大的收获就是: 在面对网络流问题时,如果一时想不出很好的构图方法,不如先构造一个…