P3128 [USACO15DEC]Max Flow P---------------------------树上差分
题目描述Farmer John has installed a new system of N-1N−1 pipes to transport milk between the NN stalls in his barn (2 \leq N \leq 50,0002≤N≤50,000), conveniently numbered 1 \ldots N1…N. Each pipe connect...
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2020-02-28 21:25:16 ·
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