house robber in a binary tree leetcode code example

Example: house robber leetcode

public int rob(int[] nums) {
    if(nums==null||nums.length==0)
        return 0;
 
    if(nums.length==1)
        return nums[0];
 
    int[] dp = new int[nums.length];
    dp[0]=nums[0];
    dp[1]=Math.max(nums[0], nums[1]);
 
    for(int i=2; i<nums.length; i++){
        dp[i] = Math.max(dp[i-2]+nums[i], dp[i-1]);
    }
 
    return dp[nums.length-1];
}