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 memo[10000];
int get(int arr[],int len,int cur){
if(memo[cur])
    return memo[cur];
int result=1;
if(len-1==cur)
    return 1;
for(int i=cur+1;i<len;i++){
    if(arr[i]>=arr[cur])
    result=max(result,1+get(arr,len,i));
}
return memo[cur]=result;
}
int main(void){ios_base::sync_with_stdio(false);cin.tie(0);
 int n,k;
 vector<pair<int,int> >skills;
 int newarr[5000];
 cin >> n >> k;
 for(int i=0;i<n;i++){
    int a;
 cin >> a;
    skills.push_back(make_pair(a,i));
 }
 sort(skills.begin(),skills.end());
 for(int i=0;i<n;i++){
    newarr[skills[i].second]=i/k;
 }
 int result=0;
  for(int i=0;i<n;i++){
    result=max(result,get(newarr,n,i));
 }
 cout << n-result;
}
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