HBC24992[网络流24题]骑士共存问题[USACO 2008 Dec S]Patting Heads题解

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It's Bessie's birthday and time for party games!

It's Bessie's birthday and time for party games! Bessie has instructed the N (1 <= N <= 100,000) cows conveniently numbered 1..N to sit in a circle (so that cow i [except at the ends] sits next to cows i-1 and i+1; cow N sits next to cow 1). Meanwhile, Farmer John fills a barrel with one billion slips of paper, each containing some integer in the range 1..1,000,000. Each cow i then draws a number Ai (1 <= Ai <= 1,000,000) (which is not necessarily unique, of course) from the giant barrel. Taking turns, each cow i then takes a walk around the circle and pats the heads of all other cows j such that her number Ai is exactly divisible by cow j's number Aj; she then sits again back in her original position. The cows would like you to help them determine, for each cow, the number of other cows she should pat.

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标签： HBC24992[网络流24题]骑士共存问题[USACO 2008 Dec S]Patting Heads题解