#include "boxes.h"
#include "bits/stdc++.h"
using namespace std;
long long delivery(int n, int k, int l, int a[]) {
vector<long long> dp(n + 5, 0), cdp(n + 5, 0);
for(int i = 0; i < n; i++){
if(i - k >= 0) dp[i] = dp[i - k] + 2 * a[i];
else dp[i] = 2 * a[i];
}
for(int i = n - 1; i >= 0; i--){
if(i + k < n) cdp[i] = cdp[i + k] + 2 * (l - a[i]);
else cdp[i] = 2 * (l - a[i]);
}
long long res = min(dp[n - 1], cdp[0]);
for(int i = 0; i < n - 1; i++){
res = min(res, dp[i] + cdp[i + 1]);
}
res = min(res, min(dp[n - k], cdp[k]) + l);
for(int i = k; i < n; i++){
res = min(res, dp[i - k] + cdp[i + 1] + l);
}
return res;
}
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