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Description T is a complete binary tree consisting of n vertices. It means that exactly one vertex is a root, and each vertex is either a leaf (and do 阅读全文
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Description n children are standing in a circle and playing the counting-out game. Children are numbered clockwise from 1 to n. In the beginning, the 阅读全文
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Description There are n cities situated along the main road of Berland. Cities are represented by their coordinates — integer numbers a1, a2, ..., an. 阅读全文