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There are n members in our ACM club. Little W wants to select three persons from our club to form a new team taking part in provincial ACM contests, a 阅读全文
posted @ 2020-07-29 21:21
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Tokitsukaze has a sequence of length n, denoted by a . Tokitsukaze can merge two consecutive elements of a as many times as she wants. After each oper 阅读全文
posted @ 2020-07-29 16:16
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Given a string P consisting of only parentheses and asterisk characters (i.e. "(", ")" and ""), you are asked to replace all the asterisk characters i 阅读全文
posted @ 2020-07-29 11:28
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