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问一下这样做 怎么错了这题是不是 求流量为2时的最小费用 我把每条边的容量设为1 用bf按费用求最短路 求完后更新残留网中的流量 求了两次退出 然后输出费用 可是WA了 我就是把1作为源点，n作为汇点 Followed by:
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