hdu 1016 搜烦

雪黛依梦 — Wed, 18 Aug 2010 06:25:00 GMT

#include <stdio.h>
#include <stdlib.h>

int n;
static int visited[20];
static int stack[20];
int top;

int prime[38] = {0,0,1,1,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1};

void dfs (int i,int top)
{
     stack[top] = i;
    if (top == n - 1)
    {

        for (int m = 2; m <= n; m ++)
        {
            if (prime[stack[top] + m] && prime[m + 1] && !visited[m])
            {
                stack[top + 1] = m;
                 //printf ("%d\n",m);
                for (m = 1; m <= n; m ++)
                {
                    printf (m == 1 ? "%d" :" %d", stack[m]);
                }
                printf ("\n");
            }
        }
    }

    else
    {
        for (int j = 1; j <= n; j ++)
        {
            if (prime[i + j] && !visited[j])
            {
                visited[j] = 1;
                dfs (j,top+1);
                visited[j] = 0;
            }
        }
    }
}

int main ()
{
    int cn = 0;

    while ( scanf ("%d", &n) != EOF )
    {
        printf ("Case %d:\n",++ cn);
        visited[1] = 1;   top = 1;
        dfs (1,top);
        printf ("\n");
    }
    return 0;
}

雪黛依梦 2010-08-18 14:25 发表评论

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hdu 1016 搜烦