/in/foo.cc: In function 'int main()':
/in/foo.cc:30:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i = 0;i < n;i++)
  ^~~
/in/foo.cc:46:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   cout<<arr[k].num<<" "<<arr[k].grade<<endl;
   ^~~~