/in/foo.cc: In function 'mat cf(mat, mat)':
/in/foo.cc:28:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i=1;i<=n;i++)
  ^~~
/in/foo.cc:36:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   return ans;
   ^~~~~~