厨房小钟

#include <string>
using namespace std;

string two(int x) {
    string s = to_string(x);
    if (x < 10) {
        s = "0" + s;
    }
    return s;
}

class Clock {
public:
    int hour;
    int minute;

    Clock(int h, int m) {
        hour = h;
        minute = m;
    }

    void add(int minutes) {
        // 在这里写：往后拨 minutes 分钟
    }

    string show() const {
        return two(hour) + ":" + two(minute);
    }
};

string clock_after(int h, int m, int minutes) {
    Clock c(h, m);
    c.add(minutes);
    return c.show();
}