对一个排列\(\pi\)做一个\(risk\)操作得到一对SYT，记作\(risk(\pi)=(P,Q)\)
risk操作是\(S_n\)到【the set of pairs of Standard Young Tableaux \((P, Q)\) having identical shape and consisting of \(n\) boxes each】的bijection
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资料来自网络
书用的是Combinatorics of permutations by Miklos Bona
原文：https://www.cnblogs.com/yhm138/p/13495999.html