func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     vector<int> arr(n);     for (auto &i : arr) cin >> i;     int maxx = 0;     for (auto i : arr) maxx = max(maxx, i);     cout << (maxx xor arr.back());     return 0;   }   