最大流 1 - 問題

#456. 最大流 1

統計

这是一道简单版本的最大流，你可以预期使用正确实现的 Dinic 算法或是其他算法来通过本题。

给定 $n$ 个点，$m$ 条边，给定每条边的容量，求从点 $s$ 到点 $t$ 的最大流。

输入格式

第一行四个整数 $ n , m , s , t $。

接下来的 $ m $ 行，每行三个整数 $ u , v , c $，表示 $ u $ 到 $ v $，流量为 $ c $ 的一条边。

输出格式

输出点 $ s $ 到点 $ t $ 的最大流。

样例数据

样例输入

样例输出

子任务

对于所有数据 $ 1 \leq n \leq 500$, $1 \leq m \leq 20\,000$, $1 \leq c \leq 10^9$

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