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Magic Squares 魔板描述在成功地发明了魔方之后，拉比克先生发明了它的二维版本，称作魔板。这是一张有8个大小相同的格子的魔板：1 2 3 4 8 7 6 5我们知道魔板的每一个方格都有一种颜色。这8种颜色用前8个正整数来表示。可以用颜色的序列来表示一种魔板状态，规定从魔板的左上角开始，沿顺时针方向依次取出整数，构成一个颜色序列。对于上图的魔板状态，我们用序列（1，2，3，4... 阅读全文
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http://hi.baidu.com/raulliubo/blog/item/21a2ae8f998408eef11f3629.html 学了一段时间ＯＩ，感觉ＤＰ学不透。。。。转个贴来激励自己 给定两个序列 X = { x1 , x2 , ... , xm } Y = { y1 , y2 , ... , yn } 求X和Y的一个最长公共子序列 举例 X = { a , b , c , b ... 阅读全文
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section1.1 the next problem is Greedy Gift Givers A group of NP (2 ≤ NP ≤ 10) uniquely named friends has decided to exchange gifts of money. Each of these friends might or might not give some money to... 阅读全文
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http://hi.baidu.com/raulliubo/blog/item/356d8aef929862efce1b3eb8.html Friday the Thirteenth Is Friday the 13th really an unusual event? That is, does the 13th of the month land on a Friday less of... 阅读全文
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http://hi.baidu.com/raulliubo/blog/item/aea59710d589fc01213f2eba.html Broken Necklace You have a necklace of N red, white, or blue beads (3s[j]) and (s[j]' ') then break; inc(s1); end; s2:=0;... 阅读全文