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Discription Heidi is terrified by your estimate and she found it unrealistic that her friends would collaborate to drive her into debt. She expects th 阅读全文
posted @ 2018-05-04 18:28
蒟蒻JHY
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Discription A string t is called nice if a string "2017" occurs in t as a subsequence but a string "2016" doesn't occur in t as a subsequence. For exa 阅读全文
posted @ 2018-05-04 11:01
蒟蒻JHY
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