HBC25098抗疫必胜1,思维[USACO 2006 Dec S]Cow Picnic题解

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Each of Farmer John's K cows is grazing in one of N pastures, conveniently numbered 1...N. The pastures are connected by M one-way paths .The cows want to gather in the same pasture for their picnic, but some cows may only be able to get to some pastures. Help the cows out by figuring out how many pastures are reachable by all cows, and hence are possible picnic locations.

The cows are having a picnic! Each of Farmer John's K (1 ≤ K ≤ 100) cows is grazing in one of N (1 ≤ N ≤ 1,000) pastures, conveniently numbered 1...N. The pastures are connected by M (1 ≤ M ≤ 10,000) one-way paths (no path connects a pasture to itself). The cows want to gather in the same pasture for their picnic, but (because of the one-way paths) some cows may only be able to get to some pastures. Help the cows out by figuring out how many pastures are reachable by all cows, and hence are possible picnic locations.

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标签： HBC25098抗疫必胜1 思维[USACO 2006 Dec S]Cow Picnic题解