#include <algorithm>
#include <cstdlib>
#include <vector>

long long arrayMaximalAdjacentDifference(const std::vector<int>& a)
{
    long long dif = 0;
    for (std::size_t i = 1; i + 1 < a.size(); ++i) {
        long long left = std::llabs(static_cast<long long>(a[i]) - a[i - 1]);
        long long right = std::llabs(static_cast<long long>(a[i]) - a[i + 1]);
        dif = std::max({dif, left, right});
    }

    return dif;
}