源代码

#include<bits/stdc++.h>
using namespace std;
int v,m,t,s,h;
int main()
{
cin>>s>>v;
t=ceil(1.0*s/v);
h=(t+10)/60;
m=(t+10)%60;
if(h<=9){cout<<0<<8-1-h<<":"<<60-m;}
else{cout<<31-h<<":"<<60-m;}
return 0;
}