然后是几点

#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
#define endl '\n'
using namespace std;
int main()
{
    ios::sync_with_stdio(false); cin.tie(0);
    string s;
    int k;
    cin >> s >> k;
    int sum = 0;
    if (s.size() == 4) {
        sum = ((s[0] - '0') * 10 + s[1] - '0') * 60 + (s[2] - '0') * 10 + s[3] - '0';
    }
    else {
        sum = (s[0] - '0') * 60 + (s[1] - '0') * 10 + s[2] - '0';
    }
    sum += k;
    cout << sum / 60 ;
    printf("%02d", sum % 60);
    return 0;
}