卡在了第九个测试点，求大佬帮忙

#include<iostream>
using namespace std;
int main(){
    int s,v,f,h;
    cin >> s>>v;
    h= (s/v+10)/60;
    f= (s/v+10) % 60;
    if((s/v+10)%60 == 0)f++;

    if(h == 0) cout << "07";
    else if (h < 8) cout << "0" << 7-h;
    else cout << 24+7 - h ;

    cout << ":";

    if(f>=50) cout << "0" << 59-f;
    else cout << 59-f;

    return 0 ;
}