ABC390的B题是什么东西，一直WA一个点，求各位大佬调试

#include<iostream>
using namespace std;
int main()
{
	long long n, a[120];
	cin >> n;
	for(long long i = 1; i <= n; i ++)
	{
		cin >> a[i];
	}
	if(n == 2)
	{
		cout << "Yes";
		return 0;
	}
	double s = (a[1] * 1.0) / (a[2] * 1.0);
	for(long long i = 2; i < n; i ++)
	{
		if((a[i] * 1.0) / (a[i + 1] * 1.0) != s)
		{
			cout << "No";
			return 0;
		}
	}
	cout << "Yes";
	return 0;
}