This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
const int maxN = 1e5*3;
int main()
{
int n, m;
cin>>n>>m;
int a[maxN];
for(int i = 1; i <= n; i++)cin>>a[i];
int uses=0;
int curH=0;
for(int i = 1; i <= n; i++){
if(curH+m>=a[i])curH=a[i];
else{ curH=curH+m;uses++;}
}
cout<<uses;
return 0;
}
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