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Problem 3790 >> 这题题意没问题吗
Cydiater @ 2017-11-17 20:52:20
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如果机器2只能连接两个回文串,那么 abcdef 就根本构造不了吧?
kevinshuai @ 2017-12-13 16:38:23
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a也是回文串啊
iloi @ 2017-12-14 11:31:25
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一个字母也算是回文串吧
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