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摘要： 问题 C: Cities 题目描述 There are n cities in Byteland, and the ith city has a value ai. The cost of building a bidirectional road between two cities is the 阅读全文

摘要： 问题 A: Anagram 题目描述 Orz has two strings of the same length: A and B. Now she wants to transform A into an anagram of B (which means, a rearrangement of 阅读全文