BlackJack

C. The Intriguing Obsessiontime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard output— This is not playing but duty a

2839: 集合计数Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 521  Solved: 285[Submit][Status][Discuss]Description一个有N个元素的集合有2^N个不同子集（包含空集），现在要在这2^N个集合中取出若干集合（至少一个），使得它们的交集的元素个数为K，求取法的方案数，答案

PERIODNI - PeriodniLuka is bored in chemistry class so he is staring at a large periodic table of chemical elements hanging from a wall above the blackboard. To kill time, Luka decided to make his

Count the BuildingsTime Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 2551    Accepted Submission(s): 827Problem DescriptionThere are N buildings s...

JZPTREETime Limit: 20000/10000 MS (Java/Others)    Memory Limit: 655360/655360 K (Java/Others)Total Submission(s): 387    Accepted Submission(s): 166Problem DescriptionThere is a tree,there is a life....

4555: [Tjoi2016&Heoi2016]求和Time Limit: 40 Sec  Memory Limit: 128 MBSubmit: 580  Solved: 458[Submit][Status][Discuss]Description在2016年，佳媛姐姐刚刚学习了第二类斯特林数，非常开心。现在他想计算这样一个函数的值:S(i, j)表示第二类斯特林数，递推公式为:S(...

Connected GraphTime Limit: 1000MS Memory Limit: 30000KTotal Submissions: 3459 Accepted: 1679DescriptionAn undirected graph is a set V of vertices and a set of E∈{V*V} edges.An undirected graph is conn...

5093: 图的价值Time Limit: 30 Sec  Memory Limit: 256 MBSubmit: 176  Solved: 89[Submit][Status][Discuss]Description“简单无向图”是指无重边、无自环的无向图（不一定连通）。一个带标号的图的价值定义为每个点度数的k次方的和。给定n和k，请计算所有n个点的带标号的简单无向图的价值之和。因为答案很大，请...