rt，以 CSP-J 2019 T1 为例，这么写能过吗？

#include <bits/stdc++.h>
using namespace std;
int main()
{
    freopen ("game.in", "r", stdin);
    freopen ("game.out", "w", stderr);
    int n, a;
    cin >> n;
    a = n % 9;
    printf ("in = %d\n", n);
    printf ("out = %d\n", a);
    cerr << a << endl;
    return 0;
}