Custom Test

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, a, n) for(ll i = a; i < n; ++i)

int main() {
  ll n = 10000000;
  rep(i, 0, n) printf("%d ", n);
}

3587 ms(GNU C++17 9.2.0 (64bit,2msys)) 1996 ms(GNU C++17 7.3.0)

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, a, n) for(ll i = a; i < n; ++i)

int main() {
  ll n = 10000000;
  rep(i, 0, n) cout << 1000000 << " ";
}

1138 ms(GNU C++17 9.2.0 (64bit,2msys)) 1544 ms(GNU C++17 7.3.0)

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, a, n) for(ll i = a; i < n; ++i)

int main() {
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  ll n = 10000000;
  rep(i, 0, n) cout << 1000000 << " ";
}