Rewrite the solution


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    Re: [Java O(n) solution](space O(1))
    @tusizi : Your solution is awesome! I just made a few change to make it easy to understand.

    public class Solution {
        public int rob(int[] nums) {
            int prevNo = 0;     // max money can get if NOT rob previous house
            int prevYes = 0;    // max money can get if rob previous house
            for (int n : nums) {
                //1.Rob the current house
                int currYes =  prevNo + n;  //previous not robbed + current house
                //2.Don't rob
                int currNo = Math.max(prevNo, prevYes); //Max of the previous cell robbed and not robbed -- Optimal substructure.
    
                //Update values for the next round
                prevNo = currNo;
                prevYes = currYes;
            }
    
            return Math.max(prevNo, prevYes);
        }
    }
    

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