下面的程序属于哪种算法(     )。

int pos[8];

void queen(int n) {

for (int i = 0; i < 8; i++) {

pos[n] = i;

bool attacked = false;

for (int j = 0; j < n; j++)

if (pos[n] == pos[j] || pos[n] + n == pos[j] + j || pos[n] - n == pos[j]

- j) {

attacked = true;

break;

}

if (attacked)

continue;

if (n == 7) {

return;

} else {

queen(n + 1);

}

}

}