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转载至：http://blog.youkuaiyun.com/mtrix/article/details/61200302 给集合里的元素一个顺序，那么就可以用整数表示集合，某一位为1表示对应元素被选取。         设x为表示集合的整数，那么这个整数有如下性质：          x的子集整数y在数值上不会比x大。因为x的子集y只是保留了x某些位置上的1，所以y总可以加上一个非负的

题目链接：http://codeforces.com/contest/333/problem/E题面：Many schoolchildren look for a job for the summer, and one day, when Gerald was still a schoolboy, he also decided to work in the summer. But as Gera...

题目链接：https://vjudge.net/problem/SPOJ-R6PLRainbow 6 is a very popular game in colleges. There are 2 teams, each having some members and the 2 teams play some matches against each other. The team which ...

题目链接：https://vjudge.net/problem/SPOJ-ADAORANGAda the Ladybug lives near an orange tree. Instead of reading books, she investigates the oranges. The oranges on orange tree can be in up to 5*50 Shades o...