题目描述
The N cows (2 <= N <= 1,000) conveniently numbered 1..N are grazing among the N pastures also conveniently numbered 1..N. Most conveniently of all, cow i is grazing in pasture i.The N cows (2 <= N <= 1,000) convenientl
阅读背景：
[USACO08OCT]牧场散步Pasture Walking BZOJ1602 LCA
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