#include"boxes.h"
#include<bits/stdc++.h>
using namespace std;
const long long INF=1e18;
long long delivery(int N,int K,int L,int p[])
{
vector<long long> dpl(N),dpr(N);
for(int i=0;i<N;i++)
{
dpl[i]=p[i]*2;
if(i>=K) dpl[i]+=dpl[i-K];
}
for(int i=N-1;i>=0;i--)
{
dpr[i]=(L-p[i])*2;
if(i+K<N) dpr[i]+=dpr[i+K];
}
long long ans=min(dpl[N-1],dpr[0]);
for(int i=0;i+1<N;i++) ans=min(ans,dpl[i]+dpr[i+1]);
for(int i=0;i+K-1<N;i++)
{
long long sum=L;
if(i) sum+=dpl[i-1];
if(i+K<N) sum+=dpr[i+K];
ans=min(ans,sum);
}
return ans;
}
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