uva 524（素数环）

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 numbers in two adjacent circles should be a prime.

Note: the number of first circle should always be 1.

Input

n (0 < n <= 16)

Output
The output format is shown as sample below. Each row represents a series of circle numbers in the ring beginning from 1 clockwisely and anticlockwisely. The order of numbers must satisfy the above requirements.

You are to write a program that completes above process.

Sample Input

6
8

Sample Output

Case 1:
1 4 3 2 5 6
1 6 5 2 3 4

Case 2:
1 2 3 8 5 6 7 4
1 2 5 8 3 4 7 6
1 4 7 6 5 8 3 2
1 6 7 4 3 8 5 2

#include<cstdio>
#include<algorithm>
using namespace std;
int S[20];
int main()
{
    int n,casex=1;
    long long ans,a;
    while(scanf("%d",&n)!=EOF)
    {
       ans=0;
        for(int i=1;i<=n;i++)
            scanf("%d",&S[i]);
        for(int i=1;i<=n;i++)
        {
            for(int j=i;j<=n;j++)
            {
                    a=1;
                for( int k=i;k<=j;k++)
                {
                    a*=S[k];
                }
                ans=max(ans,a);

            }
        }
            printf("Case #%d: The maximum product is %lld.\n\n",casex,ans);
            casex++;
    }
    return 0;
}

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