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Musical Theme Description A musical melody is represented as a sequence of N (1<=N<=20000)notes that are integers in the range 1..88, each representin 阅读全文
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Long Long Message Description The little cat is majoring in physics in the capital of Byterland. A piece of sad news comes to him these days: his moth 阅读全文
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D. Iahub and Xors Iahub does not like background stories, so he'll tell you exactly what this problem asks you for. You are given a matrix a with n ro 阅读全文
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The war Problem Description In the war, the intelligence about the enemy is very important. Now, our troop has mastered the situation of the enemy's w 阅读全文
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E. Sign on Fence Bizon the Champion has recently finished painting his wood fence. The fence consists of a sequence of n panels of 1 meter width and o 阅读全文
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C. Inna and Candy Boxes Inna loves sweets very much. She has n closed present boxes lines up in a row in front of her. Each of these boxes contains ei 阅读全文
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Sequence I Problem Description Mr. Frog has two sequences a1,a2,⋯,an and b1,b2,⋯,bm and a number p. He wants to know the number of positions q such th 阅读全文
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Sequence II Problem Description Mr. Frog has an integer sequence of length n, which can be denoted as a1,a2,⋯,an There are m queries.In the i-th query 阅读全文
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Zhu and 772002 Problem Description Zhu and 772002 are both good at math. One day, Zhu wants to test the ability of 772002, so he asks 772002 to solve 阅读全文
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E. Cactus A connected undirected graph is called a vertex cactus, if each vertex of this graph belongs to at most one simple cycle. A simple cycle in 阅读全文