我%--&(¥--,调了一下午,最后发现P赋值1e5能过,赋值1e6就会TLE致死.改了一下午加一晚上然而这是为什么??? 一种常见的建图套路,首先二分答案,注意上界要取大一点,1e9是不行的.然后问题变为判定,首先弗洛伊德求出点两两之间的最短距离.每次建图时把点拆成两个,然后s向所有的i连容量为a[i]的边,所有i+n向t连容量为b[i]的边.对于原图中的一条边(u,v),如果长度小于等于当前二分的mid的,连接u和v+n,容量为inf.(因为可以同时走) 记得来long long #incl…
题目描述 FJ's cows really hate getting wet so much that the mere thought of getting caught in the rain makes them shake in their hooves. They have decided to put a rain siren on the farm to let them know when rain is approaching. They intend to create a…
Ombrophobic Bovines Time Limit: 1000MSMemory Limit: 65536K Total Submissions: 14519Accepted: 3170 Description FJ's cows really hate getting wet so much that the mere thought of getting caught in the rain makes them shake in their hooves. They have de…