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题目描述 跳跳棋是在一条数轴上进行的。棋子只能摆在整点上。每个点不能摆超过一个棋子。 我们用跳跳棋来做一个简单的游戏：棋盘上有3颗棋子，分别在a，b，c这三个位置。我们要通过最少的跳动把他们的位置移动成x，y，z。（棋子是没有区别的） 跳动的规则很简单，任意选一颗棋子，对一颗中轴棋子跳动。跳动后两颗 阅读全文
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Discription You are given a tree consisting of nn vertices. A number is written on each vertex; the number on vertex ii is equal to aiai. Let's denote 阅读全文
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Problem Statement Aoki loves numerical sequences and trees. One day, Takahashi gave him an integer sequence of length N, a1,a2,…,aN, which made him wa 阅读全文