/in/foo.cc: In function 'int main()':
/in/foo.cc:56:6: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
   if (i >= n-1)
      ^
/in/foo.cc:45:6: warning: unused variable 'before' [-Wunused-variable]
  int before = 0;
      ^~~~~~