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Divisiblity of DifferencesYou are given a multiset of n integers. You should select exactly k of them in a such way that the differenc... 阅读全文
posted @ 2017-11-12 15:10
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Sorting the CoinsRecently, Dima met with Sasha in a philatelic store, and since then they are collecting coins together. Their favorit... 阅读全文
posted @ 2017-11-12 15:00
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Balanced SubstringYou are given a string s consisting only of characters 0 and 1. A substring [l, r] of s is a string slsl + 1sl + 2..... 阅读全文
posted @ 2017-11-12 14:35
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