198\. House Robber

Medium

You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent houses have security systems connected and **it will automatically contact the police if two adjacent houses were broken into on the same night**.

Given an integer array `nums` representing the amount of money of each house, return _the maximum amount of money you can rob tonight **without alerting the police**_.

**Example 1:**

**Input:** nums = [1,2,3,1]

**Output:** 4

**Explanation:**

    Rob house 1 (money = 1) and then rob house 3 (money = 3).
    Total amount you can rob = 1 + 3 = 4. 

**Example 2:**

**Input:** nums = [2,7,9,3,1]

**Output:** 12

**Explanation:**

    Rob house 1 (money = 2), rob house 3 (money = 9) and rob house 5 (money = 1).
    Total amount you can rob = 2 + 9 + 1 = 12. 

**Constraints:**

*   `1 <= nums.length <= 100`
*   `0 <= nums[i] <= 400`