View Compilation Error

0_0_39581454_30974.cpp: In function 'int main()':
0_0_39581454_30974.cpp:39:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   39 |                 ans=max(ans,dfs(i,j));
      |                 ^~~
      |                 abs
0_0_39581454_30974.cpp:42:15: error: 'ans' was not declared in this scope; did you mean 'abs'?
   42 |         cout<<ans<<endl;
      |               ^~~
      |               abs