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题目描述已知 n 个整数 x1,x2,…,xn，以及一个整数 k（k＜n）。从 n 个整数中任选 k 个整数相加，可分别得到一系列的和。例如当 n=4，k＝3，4 个整数分别为 3，7，12，19 时，可得全部的组合与它们的和为：3＋7＋12=22 3＋7＋19＝29 7＋12＋19＝38 3＋12＋19＝34。现在，要求你计算出和为素数共有多少种。例如上例，只有一种的和为素

链接：https://ac.nowcoder.com/acm/contest/888/D来源：牛客网时间限制：C/C++ 1秒，其他语言2秒空间限制：C/C++ 524288K，其他语言1048576K64bit IO Format: %lld分数：2500 前期题但是貌似没想到题目描述Gromah and LZR have entered the fourth level. The...

描述小城和小华都是热爱数学的好学生，最近，他们不约而同地迷上了数独游戏，好胜的他 们想用数独来一比高低。但普通的数独对他们来说都过于简单了，于是他们向 Z博士请教， Z 博士拿出了他最近发明的“靶形数独” ，作为这两个孩子比试的题目。 靶形数独的方格同普通数独一样，在 9 格宽×9 格高的大九宫格中有 9 个 3 格宽×3 格 高的小九宫格（用粗黑色线隔开的） 。在这个大九宫格中，有一

time limit per test : 2 secondsmemory limit per test : 256 megabytesWhile dad was at work, a little girl Tanya decided to play with dad’s password to his secret database. Dad’s password is a string ...

time limit per test : 1 secondmemory limit per test : 256 megabytesAs we all know, Max is the best video game player among her friends. Her friends were so jealous of hers, that they created an actu...

Time Limit: 1000/1000 MS (Java/Others)Memory Limit: 131072/131072 K (Java/Others)Problem DescriptionArbiter is a kind of starship in the StarCraft science-fiction series. The Arbiter-class starship...

time limit per test : 1 secondmemory limit per test : 256 megabytesYou are given an array a consisting of nnn integers, and additionally an integer mmm. You have to choose some sequence of indices b...

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Problem Description Prairie dog comes again! Someday one little prairie dog Tim wants to visit one of his friends on...

DescriptionAlice and Bob want to go on holiday. Each of them has planned a route, which is a list of cities to be visited in a given order. A route may contain a city more than once. As they want t...

Time Limit: 2000MS Memory Limit: 65536KDescriptionA university network is composed of N computers. System administrators gathered information on the traffic between nodes, and carefully divided t...

Time Limit: 2000MS Memory Limit: 131072K Special JudgeDescriptionImagine you are standing inside a two-dimensional maze composed of square cells which may or may not be filled with rock. You c

Time Limit: 2000MS Memory Limit: 65536KDescription Acm, a treasure-explorer, is exploring again. This time he is in a special maze, in which there are some doors (at most 5 doors, represented by ‘

time limit per test : 10.0 smemory limit per test : 256 MBIn graph theory, a vertex cover of a graph GGG is a set of vertices SSS such that each edge of the graph is incident to at least one vertex ...