我只得了80分，麻烦大佬指正

#include<iostream>
using namespace std;
int main()
{
    int h1,h2,h3,h4,p;
    double s,v,o;                   
    cin>>s>>v;
    o=s/v;
    p=int(o);
    if (o>p){o=o+1;}
    else{o=p;}
    h1=o+10;
    if (h1<=480 or h1>1320)
    {
        if (h1<=480)
        {h2=480-h1;}
        else 
        {h2=1920-h1;}
        h3=h2/60;
        h4=h2%60;
        cout<<"0"<<h3<<":"<<h4;
    }
    else
    {
        h2=1920-h1;
        h3=h2/60;
        h4=h2%60;
        cout<<h3<<":"<<h4;
    }
    return 0;
}