foo.cc: In function ‘int countTotalCircles(std::string)’:
foo.cc:44:9: error: expected ‘,’ or ‘;’ before ‘for（int’
   44 |         for（int i=0;i<num.length();i++) cnt += countCircles(num[i]);
      |         ^~~~~~~~
foo.cc:44:22: error: ‘i’ was not declared in this scope
   44 |         for（int i=0;i<num.length();i++) cnt += countCircles(num[i]);
      |                      ^