#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;
long long delivery(int N, int k, int L, int p[]) {
sort(p, p + N);
vector<long long> cw(N), ccw(N);
for (int i = 0; i < N; i++) {
cw[i] = 2 * p[i] + (i >= k ? cw[i - k] : 0);
}
for (int i = N - 1; i >= 0; i--) {
ccw[i] = 2 * (L - p[i]) + (i + k < N ? ccw[i + k] : 0);
}
long long ans = min(cw[N - 1], ccw[0]);
for (int i = 1; i < N; i++) {
ans = min(ans, cw[i - 1] + ccw[i]);
}
if (k == N) ans = min(ans, (long long)L);
else {
ans = min(ans, cw[N - k - 1] + L);
ans = min(ans, ccw[k] + L);
for (int i = 0; i + k + 1 < N; i++) {
ans = min(ans, cw[i] + ccw[i + k + 1] + L);
}
}
return ans;
}
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