代码如下

using namespace std;
int main()
{
	int S,  t, i=0;
	long v;
	scanf("%d %ld", &S, &v);
	if (S % v == 0)
		t = S / v;
	else
		t = S / v + 1;
	while (t >= 60)
	{
		t = t - 60;
		i++;
	}
	i = 7 - i;
	if (i < 0)
		i = i + 24;
	t = 60 - t - 10;
	printf("%02d:%02d", i,t);
	return 0;
}```