old_contents: source = '''#include <bits/stdc++.h>
  using namespace std;
  using ll = long long int;
  
  int next_int() {
    int x;
    if(scanf("%d", &x) != 1) exit(1);
    return x;
  }
  
  ll next_ll() {
    ll x;
    if(scanf("%lld", &x) != 1) exit(1);
    return x;
  }
  
  double next_double() {
    double x;
    if(scanf("%lf", &x) != 1) exit(1);
    return x;
  }
  
  string next_string() {
    static char buf[1000000];
    if(scanf("%s", buf) != 1) exit(1);
    return string(buf);
  }
  
  char next_char() {
    char x;
    if(scanf("%c", &x) != 1) exit(1);
    return x;
  }
  
  int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
  }
  '''
  
new_contents: source = '''#include <bits/stdc++.h>
  using namespace std;
  using ll = long long int;
  using vi = vector<int>;
  using vvi = vector<vi>;
  using vll = vector<ll>;
  using vvll = vector<vll>;
  
  int next_int() {
    int x;
    if(scanf("%d", &x) != 1) exit(1);
    return x;
  }
  
  ll next_ll() {
    ll x;
    if(scanf("%lld", &x) != 1) exit(1);
    return x;
  }
  
  double next_double() {
    double x;
    if(scanf("%lf", &x) != 1) exit(1);
    return x;
  }
  
  string next_string() {
    static char buf[1000009];
    if(scanf("%s", buf) != 1) exit(1);
    return string(buf);
  }
  
  char next_char() {
    char x;
    if(scanf("%c", &x) != 1) exit(1);
    return x;
  }
  
  int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
  }
  '''
  
subject: add more stuff to template