func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, c, a[2], r = 0;   int main() {     cin >> n >> c >> a[0];     for (int i = 1; i < n; i++)       cin >> a[i % 2], r = max(r, a[i % 2 ^ 1] - a[i % 2] - c);     cout << r;   }   