算法
(模拟) $O(k)$
直接模拟即可
C++ 代码
#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
using std::cin;
using std::cout;
using std::string;
using ll = long long;
int main() {
ll n;
int k;
cin >> n >> k;
rep(i, k) {
if (n % 200 == 0) n /= 200;
else n = n * 1000 + 200;
}
cout << n << '\n';
return 0;
}