Как отразить часы в c++

 #include <cctype> 
#include <iostream> 
#include <string> 
#include <vector>

using namespace std;

class Mirrortime { 
    string time; 
    int min; 
    string mirror() const { 
        constexpr auto total = 720; 
        if (min == total) return "12:00"s; 
        const auto inv = total - min; 
        const auto h = inv / 60; 
        const auto m = inv % 60; 
        string t; 
        if (!h) t = "12:"; 
        else { 
            if (h < 10) t += '0'; 
            t += to_string(h) + ':'; 
        } 
        if (m < 10) t += '0'; 
        t += to_string(m); 
        return t; 
    } 
    void split() { 
        min = stoi(string(time.begin(), time.begin() + 2)) * 60; 
        min += stoi(string(time.begin() + 3, time.end())); 
    } 
    friend istream& operator>>(istream& inp, Mirrortime& mt) { 
        inp >> mt.time; 
        mt.split(); 
        return inp; 
    } 
    friend ostream& operator<<(ostream& out, const Mirrortime& mt) { 
        return out << mt.mirror(); 
    } 
};

int main() { 
    size_t n; 
    cin >> n; 
    vector<Mirrortime> times(n); 
    for (auto& time : times) cin >> time; 
    cout.put('\n'); 
    for (const auto& time : times) cout << time << '\n'; 
    system("pause > nul"); 
}