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#include <iostream>
#include <iterator>
#include <windows.h>
using namespace std;
int Prime[]={0,0,1,1,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,
0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,0,0,1,0,1,0,0,0,0};
void PrimeRing( int n ){
int *a=new int[n+1], *l=new int[n+1], *u=new int[n+1];
int k, p, q;
for( k=0; k<n; ++k ) l[k]=k+1;
l[n]=0;
k=1;
X2: p=0; q=l[0];
X3: a[k]=q;
if( a[1]>1 ) goto X7;
if( !( k==1 || Prime[a[k-1]+a[k]] ) )
goto X5;
else
if( k==n && Prime[a[1]+a[n]] ){
copy( a+1, a+n+1, ostream_iterator<int>(cout," ") ),cout<<endl;
goto X6;
}
u[k]=p; l[p]=l[q]; ++k; goto X2;
X5: p=q; q=l[p]; if( q!=0 ) goto X3;
X6: --k;
if( k==0 ) return;
p=u[k], q=a[k], l[p]=q;
goto X5;
X7: delete []a; delete []u; delete []l;
}
int main( )
{
PrimeRing( 20 );
system("PAUSE");
return EXIT_SUCCESS;
}
if(i <20)
return(check2(a[i]+a[i-1]));