/in/foo.cc: In function 'bool check(int, int, int, int)':
/in/foo.cc:42:17: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  return x1 < x2 && y1 > y2 || x1 > x2 && y1 < y2;
         ~~~~~~~~^~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:29:5: warning: 'ans2' may be used uninitialized in this function [-Wmaybe-uninitialized]
  aa %= 3600;
  ~~~^~~~~~~
/in/foo.cc:99:12: note: 'ans2' was declared here
  int ans1, ans2;
            ^~~~