呜呜呜第九个怎么都过不去，求大佬帮帮QWQ。

以下代码

#include<bits/stdc++.h>
using namespace std;
int main() {
	int s, v, t1;
	int a = 0;
	int b = 0;
	cin >> s >> v;
	t1 = s / v + 1;
	
	int m = 8 * 60 - t1 - 10;
	if (m < 0)
	{
		b = (8 * 60 + 24 * 60 - (t1 + 10)) % 60;
		a = (32 * 60 - (t1 + 10) - b) / 60;
	}
	else if (m == 0)
	{
		a = 0;
		b = 0;
	}
	else
	{
		b = (8*60-t1-10)%60;
		a = (8 * 60 - t1 - 10 - b) / 60;
	}
	cout << setfill('0') << setw(2) << a << ":" << setfill('0') << setw(2) << b << endl;


	system("pause");
	return 0;
}