#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<ll, ll>
long long delivery(int N, int K, int L, int p[]) {
vector<ll> dpl(N + 5), dpr(N + 5);
for(int i = 0; i < N; i++){
if(i < K) dpl[i] = 2 * p[i];
else dpl[i] = 2 * min(p[i], L - p[i]) + dpl[i - K];
}
for(int i = N - 1; i >= 0; --i){
if(i > N - K) dpr[i] = 2 * (L - p[i]);
else dpr[i] = 2 * min(p[i], L - p[i]) + dpr[i + K];
}
ll ans = min(dpl[N - 1], dpr[0]);
for(int i = 0; i < N - 1; i++) ans = min(ans, dpl[i] + dpr[i + 1]);
return ans;
}
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