View Compilation Error

0_0_39812056_26905.cpp: In function 'int main()':
0_0_39812056_26905.cpp:38:25: error: 'maxn' was not declared in this scope; did you mean 'main'?
   38 |                         maxn = max(maxn, a[i].first);
      |                         ^~~~
      |                         main
0_0_39812056_26905.cpp:40:25: error: 'minn' was not declared in this scope
   40 |                         minn = min(minn, a[i].second);
      |                         ^~~~