/in/foo.cc: In function 'int main()':
/in/foo.cc:26:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for (int i = sum;i >= 1; i--)
     ^~~
/in/foo.cc:32:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  printf("-1");
  ^~~~~~