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描述: Tram network in Zagreb consists of a number of intersections and rails connecting some of them. In every intersection there is a switch pointing t 阅读全文
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描述: One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is going to attend the big cow party to be held at farm #X (1 ≤ X ≤ N). A t 阅读全文
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题意: Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. For example, two is written as II in Roman numeral, just two on 阅读全文