Mã nộp #13589 | Số nguyên không âm đẹp

Main.cc: In function ‘int main()’:
Main.cc:12:9: error: ‘j’ was not declared in this scope
    for (j = L;j<=R;j++)
         ^
Main.cc:20:12: error: ‘count’ was not declared in this scope
    cout << count;
            ^~~~~