#include <iostream>
using namespace std;

class Time {

  public:
    int hours;      // 小时
    int minutes;    // 分钟

    Time() {
        hours = 0;
        minutes = 0;
    }

    Time(int h, int m) {
        this->hours = h;
        this->minutes = m;
    }

    void show() {
        cout << hours << " " << minutes << endl;
    }

    // write your code here......
    Time operator+(const Time& x) const {
        Time res;
        res.hours = this->hours + x.hours;
        res.minutes = this->minutes + x.minutes;
        if (res.minutes >= 60) {
            res.hours++;
            res.minutes -= 60;
        }
        return res;
    }

};

int main() {

    int h, m;
    cin >> h;
    cin >> m;

    Time t1(h, m);
    Time t2(2, 20);

    Time t3 = t1 + t2;
    t3.show();

    return 0;
}

operator+ 改为接受一个参数 const Time& y,然后在函数内部进行时间的相加运算,并处理可能出现的进位。同时,为了保证不修改调用对象的状态,我们将 operator+ 声明为 const 成员函数。