Codeforces Round #831
Original link: https://www.shuizilong.com/house/archives/codeforces-round-831/ http://codeforces.com/blog/entry/108451 https://zhuanlan.zhihu.com/p/579487089 meaning of the title You are given a repeatable set $A$ with $n$ elements, each element of the set $A$ is a one-element set ${a_i}$. Defining an operation consists of the following two steps: Select the two sets $S$, $T$ in $A$ whose intersection is empty. Remove both sets and […]
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