/in/foo.cc: In function 'void U(int, int)':
/in/foo.cc:34:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(ans < value || p < res && ans == value) 
                    ~~~~~~~~^~~~~~~~~~~~~~~
/in/foo.cc: At global scope:
/in/foo.cc:64:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^