/in/foo.cc: In function 'int main()':
/in/foo.cc:10:13: error: 'ans' was not declared in this scope; did you mean 'abs'?
   10 |             ans=max(ans,a[i]&a[j]);
      |             ^~~
      |             abs
/in/foo.cc:11:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   11 |     cout<<ans;
      |           ^~~
      |           abs