 * 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.
 * 
 * 
 * Sample Input: