Method to_str

679. 24 Game/Solution.cpp:83–96

    }

    string to_str(Ops op) {
        switch (op) {
            case Add:
                return "Add ";
            case Minus:
                return "Minus ";
            case Mul:
                return "Mul ";
            case Div:
                return "Div ";
            default:
                return "Not ";
        }
    }
};

int main() {