#include <bits/stdc++.h>
#define all(a) a.begin(), a.end()
#define popcount(x) __builtin_popcountll(x)
using namespace std;
using namespace chrono;
long long delivery(int n, int k, int l, int* positions) {
    int mx = 0, mn = l;
    for (int i = 0; i < n; i++) {
        mx = max(mx, positions[i]);
        mn = min(mn, positions[i]);
    }
    return min({
        mx*2,
        2*(l - mn),
        l
    });
}
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