代码随想录训练营第III期--048--python

#  198.打家劫舍 
class Solution:
    def rob(self, nums):
        if len(nums) == 0:
            return 0
        if len(nums) == 1:
            return nums[0]
        dp = [0] * len(nums) 
        dp[0] = nums[0]
        dp[1] = max(nums[0], nums[1])
        for i in range(2, len(nums)):
            dp[i] = max(dp[i-2] + nums[i], dp[i-1])
        return dp[-1]
#  213.打家劫舍II  
class Solution:
    def rob(self, nums):
        if len(nums) == 1: return nums[0]
        v1 = self.roblist(nums[1:])
        v2 = self.roblist(nums[:-1])
        return max(v1, v2)
    
    def robRange(self, nums):
        l = len(nums)
        dp = [0] * l 
        dp[0] = nums[0]
        for i in range(1, l):
            if i == 1:
                dp[i] = max(dp[i-1], nums[i])
            else:
                dp[i] = max(dp[i-1], dp[i-2] + nums[i])
        return dp[-1]
#  337.打家劫舍III
class TreeNode:
    def __init__(self, val = 0, left = None, right = None):
        self.val = val 
        self.left = left 
        self.right = right 

class Solution:
    def rob(self, root):
        dp = self.traversal(root)
        return max(dp)
    def traversal(self, node):
        if not node: return (0, 0)

        left = self.traversal(node.left)
        right = self.traversal(node.right)

        val_0 = max(left[0], left[1]) + max(right[0], right[1])

        val_1 = node.val + left[0] + right[0]

        return (val_0, val_1)