蒟蒻测试点好惨...我0分

#include<iostream>
#include<cstring>
using namespace std;
int a[200010],n,w;
int last[200010];
int t,c = 0;
struct vac
{
	int use;
	int outt;
};
int main()
{
	cin >> t;
	for(int i = 1;i <= t;i++)
	{
		vac nvac,n2vac;
		memset(a,0,sizeof(a));
		memset(last,0,sizeof(last));
		cin >> n >> nvac.use >> nvac.outt >> w;
		n2vac = nvac;
		for(int i = 1;i <= n;i++)
		{
			cin >> a[i];
			last[i] = a[i] + w;
		}
		for(int i = 1;i <= n;i++)
		{
			if(nvac.outt <= 0 || nvac.use == 0)
				nvac = n2vac,c++;
			nvac.outt -= (last[i + 1] - last[i]),nvac.use--;
		}
		cout << c << '\n';
		c = 0;
	}
	return 0;
}