func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int total, n;     cin >> total >> n;     vector<int> v(n);     for (int i = 0; i < n; i++) cin >> v[i];     int ans = 0;     for (int i = 0; i < n - 1; i++) {       ans += (total - v[i]);     }     cout << ans;   }   