說明：計算每對相鄰數之間，差的絕對值最大的數

import java.util.Scanner;

public class 最大波動 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] arr = new int[n];
        for (int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
        }

        int
 
 max = 0;
        for (int i = 0; i < n - 1; i++) {
            if (max < Math.abs(arr[i + 1] - arr[i])) {
                max = Math.abs(arr[i + 1] - arr[i]);
            }
        }

        System.out.println(max);

        sc.close();
    }
}