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Acesrc and String Theory Problem Description Acesrc is a famous string theorist at Nanjing University second to none. He insists that we should always 阅读全文
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Problem E. Split The Tree Problem Description You are given a tree with n vertices, numbered from 1 to n. ith vertex has a value wi We define the weig 阅读全文
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Problem E. TeaTree Problem Description Recently, TeaTree acquire new knoledge gcd (Greatest Common Divisor), now she want to test you. As we know, Tea 阅读全文