#include <cstdio>
/* comment */
/** comment */
int d[n][n] // comment
$a$
for (int i = 1; i <= n; i++)
  for (int j = 1; j <= n; j++)
    for (int k = 1; k <= n; k++)
      d[i,j] |= d[i,k] & d[k,j]