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题目描述 Alice and Bob are playing a simple game. They line up a row of n identical coins, all with the heads facing down onto the table and the tails upw 阅读全文
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Description N cities named with numbers 1 ... N are connected with one-way roads. Each road has two parameters associated with it : the road length an 阅读全文
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题目描述 We have a deck consisting of N cards. Each card has an integer written on it. The integer on the i-th card from the top is ai.Two people X and Y 阅读全文