/in/foo.cc: In function 'int main()':
/in/foo.cc:41:12: warning: unused variable 'c' [-Wunused-variable]
  long long c = 0;
            ^
/in/foo.cc:66:18: warning: 'q' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if (now.x == p && now.y == q)
       ~~~~~~~~~~~^~~~~~~~~~~~~
/in/foo.cc:66:3: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if (now.x == p && now.y == q)
   ^~