func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int d, n;     cin >> d >> n;     vector<int> a(n);     for (int i = 0; i < n; i++) cin >> a[i];     int day = 0, res = 0;     for (int i = 0; i < n; i++) {       day = (day + a[i] - 1) % d + 1;       if (day != a[i]) {         if (day < a[i])           res += a[i] - day;         else           res += d - day + a[i];         day = a[i];       }     }     cout << res;   }   