public class Main {
    public static void main(String[] args) {
        int[] b = {10, 30, 20, 40}; 
        int n = b.length;
 
        int[] dp = new int[n];
        dp[0] = 0;
        dp[1] = Math.abs(b[1] - b[0]);
 
        for (int i = 2; i < n; i++) {
            int jumpOne = dp[i - 1] + Math.abs(b[i] - b[i - 1]);
            int jumpTwo = dp[i - 2] + Math.abs(b[i] - b[i - 2]);
            dp[i] = Math.min(jumpOne, jumpTwo);
        }
 
        System.out.println(dp[n - 1]);
    }
}
 

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