#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;
long long delivery(int N, int K, int L, int pos[]) {
vector<int> a(pos, pos + N);
vector<long long> dp1(N + 1, 0);
for (int i = 1; i <= N; i++) {
if (i <= K)
dp1[i] = 2LL * a[i - 1];
else
dp1[i] = dp1[i - K] + 2LL * a[i - 1];
}
vector<long long> dp2(N + 1, 0);
for (int i = 1; i <= N; i++) {
long long dist = L - a[N - i];
if (i <= K)
dp2[i] = 2LL * dist;
else
dp2[i] = dp2[i - K] + 2LL * dist;
}
long long ans = LLONG_MAX;
for (int i = 0; i <= N; i++) {
ans = min(ans, dp1[i] + dp2[N - i]);
}
return ans;
}
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