rúp em vs mấy ac chuyên tin ơi

#include <bits/stdc++.h>
using namespace std;
int main (){
#define taskname "connect"
if (fopen (taskname".inp","r")){
    freopen (taskname".inp","r",stdin);
    freopen (taskname".out","w",stdout);
}
    long long n,k;
    cin >> n >> k;
    while (k--) {
        if (n%200==0) n/=200;
        else n=n*1000+200;
    }
    cout << n;
}

______________

@a2

//Xin hay nhất!!!!!!!!!!!!!!!!!!!!!!!!

`Code:`

#include<bits/stdc++.h>
using namespace std;
#define fastread() (ios_base:: sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL))

void solve(){
 int n, k; cin >> n >> k;
 while (k--){
  if (n % 200 == 0) n /= 200;
  else{
   string s = to_string(n);
   s += "200";
   n = stoi(s);
  }
 }
 cout << n << "\n";
}

int main(){
 fastread();
 solve();
return 0;
}

$\text{#KL0112}$