hdu1016(dfs)

Why 80% of the code can not do farming architect? >>>  

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#include " iostream "
using namespace std;
int a[ 1001 ],b[ 1001 ];
int used[ 1001 ];
int n;
int i,j,q,t;

void Init()
{
for (i = 1 ;i < 40 ;i ++ ) b[i] = 1 ;
for (i = 2 ;i < 40 ;i ++ )
{
for (j = 2 ;j < 40 ;j ++ )
b[i * j] = 0 ;
}
}

void dfs( int x, int y)
{
if (y == n)
{
if ( b[x + 1 ] )
{
a[n] = x;
cout << " 1 " ;
for (q = 2 ; q <= n; q ++ )
{
cout << a[q];
if (q != n) cout << " " ;
}
cout << endl;
}
}

for ( int p = 2 ;p <= n;p ++ )

if (b[x + p] && used[p] == 0 )
{
a[y] = x;
used[p] = 1 ;
dfs(p,y + 1 );
used[p] = 0 ;
}
}
int main()
{
Init();
int k = 0 ;
while (cin >> n)
{
memset(used, 0 , sizeof (used));
used[ 1 ] = 1 ;
a[ 1 ] = 1 ;
cout << " Case " <<++ k << " : " << endl;
dfs( 1 , 1 );
cout << endl;
}
return 0 ;
}

Reproduced in: https: //my.oschina.net/garyun/blog/602964