P2926 [USACO08DEC] Patting Heads S
题目描述
It's Bessie's birthday and time for party games! Bessie has instructed the N (1
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说明/提示
The 5 cows are given the numbers 2, 1, 2, 3, and 4, respectively.
The first cow pats the second and third cows; the second cows pats no cows; etc.