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B.cpp
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B.cpp
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#include<bits/stdc++.h>
#include<string>
using namespace std;
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL)
long long ara[200005];
int main()
{
fastio;
long long t,n,k,d,w,i,inc,cnt,en,cur;
cin>>t;
while(t--)
{
cin>>n>>k>>d>>w;
for(i=0;i<n;i++)
cin>>ara[i];
inc=0;
cnt=1;
for(i=0;i<n;i++)
{
if(i==0)
{
en=ara[0]+d;
cur=k-1;
}
else
{
//ara[i]-=inc;
//cout<<ara[i]<<"\n";
if(ara[i]<=en)
{
if(cur==0)
{
cnt++;
en=ara[i]+d;
cur=k-1;
}
else
cur--;
}
else if(ara[i]-w<=en)
{
if(cur!=0)
{
//inc+=min(w,ara[i]-en);
ara[i]-=min(w,ara[i]-en);
cur--;
}
else
{
cnt++;
en=ara[i]+d;
cur=k-1;
}
}
else
{
cnt++;
en=ara[i]+d;
cur=k-1;
}
}
//cout<<ara[i]<<" "<<en<<"\n";
}
cout<<cnt<<"\n";
}
return 0;
}