#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;
const int MAX = 10000005;
long long dp1[MAX], dp2[MAX];
long long delivery(int N, int K, int L, int pos[]) {
dp1[0] = 0;
for (int i = 1; i <= N; i++) {
int p = pos[i - 1];
int j = max(0, i - K);
dp1[i] = dp1[j] + p + min(p, L - p);
}
dp2[N] = 0;
for (int i = N - 1; i >= 0; i--) {
int p = pos[i];
int j = min(N, i + K);
dp2[i] = dp2[j] + (L - p) + min(p, L - p);
}
long long ans = LLONG_MAX;
for (int i = 0; i <= N; i++) {
ans = min(ans, dp1[i] + dp2[i]);
}
return ans;
}
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