/in/foo.cc: In function 'bool push_stack()':
/in/foo.cc:61:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if((isnum1&&isnum2)&&num1<=num2||(!isnum1&&!isnum2)){
     ~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:118:3: error: expected primary-expression before 'if'
   if(s.size())err=true;
   ^~
/in/foo.cc:123:10: error: expected '}' at end of input
  return 0;
          ^