标签：amp each ali term ever alert zed only NPU
The thief has found himself a new place for his thievery again. There is only one entrance to this area, called the "root." Besides the root, each house has one and only one parent house. After a tour, the smart thief realized that "all houses in this place forms a binary tree". It will automatically contact the police if two directly-linked houses were broken into on the same night.
Determine the maximum amount of money the thief can rob tonight without alerting the police.
Example 1:
Input: [3,2,3,null,3,null,1]
3
/ 2 3
\ \
3 1
Output: 7
Explanation: Maximum amount of money the thief can rob = 3 + 3 + 1 = 7.
Example 2:
Input: [3,4,5,1,3,null,1] 3 / 4 5 / \ \ 1 3 1 Output: 9 Explanation: Maximum amount of money the thief can rob = 4 + 5 = 9.
如果两间直接相连的房子在同一个晚上被闯入，它将自动报警。
确定小偷今晚可以在不报警的情况下抢劫的最大金额。
C++(8ms):
1 /** 2 * Definition for a binary tree node. 3 * struct TreeNode { 4 * int val; 5 * TreeNode *left; 6 * TreeNode *right; 7 * TreeNode(int x) : val(x), left(NULL), right(NULL) {} 8 * }; 9 */ 10 class Solution { 11 public: 12 int rob(TreeNode* root, int& l , int& r) { 13 if (root == NULL) 14 return 0 ; 15 int ll = 0 ,lr = 0 , rl = 0 , rr = 0 ; 16 l = rob(root->left,ll,lr) ; 17 r = rob(root->right,rl,rr) ; 18 return max(root->val + ll + lr + rl +rr , l+r) ; 19 } 20 21 int rob(TreeNode* root) { 22 int l ,r ; 23 return rob(root,l,r) ; 24 } 25 };
C++(1184ms):
1 /** 2 * Definition for a binary tree node. 3 * struct TreeNode { 4 * int val; 5 * TreeNode *left; 6 * TreeNode *right; 7 * TreeNode(int x) : val(x), left(NULL), right(NULL) {} 8 * }; 9 */ 10 class Solution { 11 public: 12 int rob(TreeNode* root) { 13 if (root == NULL) 14 return 0 ; 15 int val1 = root->val ; 16 if (root->left != NULL) 17 val1 += rob(root->left->left) + rob(root->left->right) ; 18 if (root->right != NULL) 19 val1 += rob(root->right->left) + rob(root->right->right) ; 20 int val2 = rob(root->left) + rob(root->right) ; 21 return max(val1,val2) ; 22 } 23 };
标签：amp each ali term ever alert zed only NPU
原文地址：https://www.cnblogs.com/mengchunchen/p/10262379.html
