/in/foo.cc: In function 'int main()':
/in/foo.cc:13:18: error: cannot convert 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size<char, std::char_traits<char>, std::allocator<char> >' from type 'std::__cxx11::basic_string<char>::size_type (std::__cxx11::basic_string<char>::)() const noexcept {aka long unsigned int (std::__cxx11::basic_string<char>::)() const noexcept}' to type 'bool'
         if(!s[i].size){
                  ^~~~
/in/foo.cc:13:18: error: in argument to unary !