text: '''
  
  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 system connected and it will automatically contact the police if two adjacent houses were broken into on the same night.
  
  Given a list of non-negative integers representing the amount of money of each house, determine the maximum amount of money you can rob tonight without alerting the police.
  
  
  
  Example 1:
  
  Input: [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: [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.
  
  '''
  
  
  
  from typing import List
  class Solution:
      def rob(self, nums: List[int]) -> int:
          
          dp_prev_2, dp_prev_1 = 0, 0
          
          for item_value in nums:
              
              dp_prev_2, dp_prev_1 = dp_prev_1, max(dp_prev_2 + item_value, dp_prev_1)
              
          return dp_prev_1
  
  
  
  # n : the length of input array, nums.
  
  ## Time Complexity: O( n )
  #
  # The overhead in time is the for loop, iterating on i, which is of O( n )
  
  ## Space Complexity: O( 1 )
  #
  # The overhead in space is the storage for looping variable, and temporary variable, which is of O( 1 ).
  
  
  from collections import namedtuple
  TestEntry = namedtuple('Entry', 'value_sequence')
  
  def test_bench():
  
      test_data = [
                      TestEntry( value_sequence = [1,2,3,1] ),
                      TestEntry( value_sequence = [2,7,9,3,1] ),
                  ]
  
      # expected output
      '''
      4
      12
      '''
  
      for t in test_data:
  
          print( Solution().rob( nums = t.value_sequence ) )
  
      return
  
  
  
  if __name__ == '__main__':
  
      test_bench()