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# XOR Partition ## 题目描述 For a set of integers $ S $ , let's define its cost as the minimum value of $ x \oplus y $ among all pairs of different intege 阅读全文
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Problem StatementYou are given a set $S$ of strings consisting of 0 and 1, and an integer $K$. Find the longest string that is a subsequence of $K$ or 阅读全文
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## 题目描述 You are given a tree with $ n $ nodes labelled $ 1,2,\dots,n $ . The $ i $ -th edge connects nodes $ u_i $ and $ v_i $ and has an unknown posi 阅读全文