func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     long long mx = 0, x = 0;     cin >> n;     for (int i = 0; i < n; i++) {       long long y;       cin >> y;       y += mx;       mx += max(0LL, x - y), x = max(y, x);     }     cout << mx << endl;     return 0;   }   