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New labyrinth attraction is open in New Lostland amusement park. The labyrinth consists of n rooms connected by m passages. Each passage is colored in 阅读全文
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Ignatius再次被魔王抓走了(搞不懂他咋这么讨魔王喜欢)…… 这次魔王汲取了上次的教训，把Ignatius关在一个n*m的地牢里，并在地牢的某些地方安装了带锁的门，钥匙藏在地牢另外的某些地方。刚开始Ignatius被关在(sx,sy)的位置，离开地牢的门在(ex,ey)的位置。Ignatius每 阅读全文
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The Czech Technical University is rather old — you already know that it celebrates 300 years of its existence in 2007. Some of the university building 阅读全文
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A subsequence of a given sequence is the given sequence with some elements (possible none) left out. Given a sequence X = < x1, x2, ..., xm > another 阅读全文
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This is yet another problem dealing with regular bracket sequences. We should remind you that a bracket sequence is called regular, if by inserting «+ 阅读全文
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There is going to be a party to celebrate the 80-th Anniversary of the Ural State University. The University has a hierarchical structure of employees 阅读全文
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'Oh no, they've done it again', cries the chief designer at the Waferland chip factory. Once more the routing designers have screwed up completely, ma 阅读全文
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Farmer John's family pitches in with the chores during milking, doing all the chores as quickly as possible. At FJ's house, some chores cannot be star 阅读全文
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一：N条直线分割平面 假设，x条线能将平面分为f(x)份，这对于份f(n) 第n条线，和其他n-1条线都有交点时，增加量最大，为n; 则： f(n)=f(n-1)+n; 有f(0)=1；得到：n 条直线分割平面的数量最大为：f(n)=n*(n+1)/2 + 1; 二. “V” 形线分割平面 对于“V 阅读全文
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Disky and Sooma, two of the biggest mega minds of Bangladesh went to a far country. They ate, coded and wandered around, even in their holidays. They 阅读全文