http://poj.org/problem?id=3207 Ikki's Story IV - Panda's Trick Time Limit: 1000MS   Memory Limit: 131072K Total Submissions: 7021   Accepted: 2604 Description liympanda, one of Ikki’s friend, likes playing games with Ikki. Today after minesweeping wi…

Ikki's Story IV - Panda's Trick Time Limit: 1000MS   Memory Limit: 131072K Total Submissions: 7296   Accepted: 2705 Description liympanda, one of Ikki’s friend, likes playing games with Ikki. Today after minesweeping with Ikki and winning so many tim…

POJ 3207 Ikki's Story IV - Panda's Trick(2-sat问题) Description liympanda, one of Ikki's friend, likes playing games with Ikki. Today after minesweeping with Ikki and winning so many times, he is tired of such easy games and wants to play another game…

POJ 3207 Ikki's Story IV - Panda's Trick liympanda, one of Ikki's friend, likes playing games with Ikki. Today after minesweeping with Ikki and winning so many times, he is tired of such easy games and wants to play another game with Ikki. liympanda…

Ikki's Story IV - Panda's Trick Time Limit: 1000MS   Memory Limit: 131072K Total Submissions: 6691   Accepted: 2496 Description liympanda, one of Ikki’s friend, likes playing games with Ikki. Today after minesweeping with Ikki and winning so many tim…

题目 liympanda, one of Ikki's friend, likes playing games with Ikki. Today after minesweeping with Ikki and winning so many times, he is tired of such easy games and wants to play another game with Ikki. liympanda has a magic circle and he puts it on a…

poj3207:http://poj.org/problem?id=3207 题意::平面上有一个圆,圆的边上按顺时针放着0..n-1共n个点.现在要连m条边,比如a,b,那么a到b可以从圆的内部连接,也可以从圆的外部连接.给你的信息中,每个点最多只能连一条边.问是否可以连接这m条边,使这些边都不相交. 题解:第一道2-sat.看了别人的题解,才理解了这样的想法.对于一条边,要么在圆内要么在圆外.两条相交的边不能同时在园内或者同时在圆外,所以一条在园内,一条在圆外.这样就是2-sat问题了.这一…

---题面--- 题意:给定一个圈,m条边(给定),边可以通过外面连,也可以通过里面连,问连完这m条边后,是否可以做到边两两不相交 题解: 将连里面和连外面分别当做一种决策(即每条边都是决策点), 如果有两条边相冲突,即如果这两条边都连里面就会导致不合法,那就 x --- > y' , y --- > x', 额...那怎么判断不合法? 注意到被边u ---> v(u < v)割成两半的分别是: u ~ v,其他, 一条边不经过这条边的充要条件是:两个端点都在这条边的同一侧. 也就…

Time Limit: 1000MS   Memory Limit: 131072K Total Submissions: 9426   Accepted: 3465 Description liympanda, one of Ikki’s friend, likes playing games with Ikki. Today after minesweeping with Ikki and winning so many times, he is tired of such easy gam…

Description liympanda, one of Ikki's friend, likes playing games with Ikki. Today after minesweeping with Ikki and winning so many times, he is tired of such easy games and wants to play another game with Ikki. liympanda has a magic circle and he put…