甜甜月饼

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2年10月21天

Silver Cow PartySilver Cow Party (最短路)

Silver Cow Party (最短路)One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is going to attend the big cow party to be held at farm #X (1 ≤ X ≤ N). A total of M (1 ≤ M ≤ 100,000) unidi