#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
ll delivery(int n,int k, int l, int positions[]){
const ll mod=1e15+7;
vector<ll> dpp(n+7);
vector<ll> dps(n+7);
for(int i=0;i<n;i++){
dpp[i]=2*positions[i];
if(i>=k){
dpp[i]+=dpp[i-k];
}
}
for(int i=n-1;i>=0;i--){
dps[i]=2*(l-positions[i]);
if(i+k<n){
dps[i]+=dps[i+k];
}
}
ll resp=mod;
ll ida;ll volta;
for(int i=-1;i<n;i++){
ida=0;volta=0;
if(i!=-1){
ida=dpp[i];
}
if(i!=n-1){
volta=dps[i+1];
}
resp=min(resp,ida+volta);
}
for(int i=-1,j=k;j<=n;j++,i++){
ida=0;volta=0;
if(i!=-1){
ida=dpp[i];
}
if(j!=n){
volta=dps[j];
}
// cout<<i<<" "<<ida<<" "<<volta<<"\n";
resp=min(resp,ida+l+volta);
}
return resp;
};
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