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;
int main(){
int n, m; cin >> n >> m;
vector<int> dp;
dp.push_back(0);
for (int i = 0; i < n; i++)
{
int a; cin >> a;
a -= (i+1) * m;
a *= -1;
auto lb = upper_bound(dp.begin(), dp.end(), a);
if(lb == dp.end()) dp.push_back(a);
else if(lb != dp.begin()) *lb = a;
}
cout << n - dp.size() + 1 << endl;
}
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