wa两个点3和5

#include<bits/stdc++.h>
using namespace std;
int main(){
	int s,v;
	cin>>s>>v;
	int am=s/v+10;
	if(double(s)/double(v)>int(s/v)) am++;
	int a=8,b=-am;
	while(b<0){		
		b+=60;
		a--;
	} 
	if(a<0){
		a+=24;
	}
	if(a<10) cout<<0;
	cout<<a<<":"<<b;
}