本文链接:http://www.cnblogs.com/Ash-ly/p/5398684.html 题意: 给你一个数字N(N <= 20),要求你把这N个数组成一个环,环内的数字不能重复,左右相邻的两个的和是素数.给出最后的答案. 思路: 利用回溯剪枝算法,N个数,每个数有N种状态,枚举这N个状态,枚举过程中剪枝优化. 代码: #include <cstdio> #include <iostream> #include <cstring> #include &l…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 34609    Accepted Submission(s): 15327 Problem Description A ring is compose of n circles as shown in diagram. Put natural numb…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 34846    Accepted Submission(s): 15441 Problem Description A ring is compose of n circles as shown in diagram. Put natural numb…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1016 Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Problem Description A ring is compose of n circles as shown in diagram. Put natural number 1, 2…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 40339    Accepted Submission(s): 17813 Problem Description A ring is compose of n circles as shown in diagram. Put natural num…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 66391    Accepted Submission(s): 28456 Problem Description A ring is compose of n circles as shown in diagram. Put natural numb…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 74594    Accepted Submission(s): 31690 Problem Description A ring is compose of n circles as shown in diagram. Put natural numb…

dfs,用全局数组和变量保存并更新当前状态. 答案可以直接在搜索结束时打印,n为奇数时方案数为0. acm.hdu.edu.cn/showproblem.php?pid=1016 #include <cstdio> #include <cstring> using namespace std; ; int n; int ans[maxn], k; ]; ]; void init(){ memset(isprime, , sizeof isprime); isprime[] = is…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 42600    Accepted Submission(s): 18885 Problem Description A ring is compose of n circles as shown in diagram. Put natural num…

UVA - 524 Prime Ring Problem Time Limit:3000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu Description A ring is composed of n (even number) circles as shown in diagram. Put natural numbers  into each circle separately, and the sum of number…