2023每日刷题(五十二)
Leetcode—337.打家劫舍III
算法思想
实现代码
/**
* Definition for a binary tree node.
* struct TreeNode {
* int val;
* TreeNode *left;
* TreeNode *right;
* TreeNode() : val(0), left(nullptr), right(nullptr) {}
* TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
* TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
* };
*/
class Solution {
public:
pair<int, int> dfs(TreeNode* root) {
if(root == nullptr) {
return {0, 0};
}
auto [left_rob, left_not_rob] = dfs(root->left);
auto [right_rob, right_not_rob] = dfs(root->right);
// 选该结点
int rob = left_not_rob + right_not_rob + root->val;
// 不选该结点
int not_rob = max(left_rob, left_not_rob) + max(right_rob, right_not_rob);
return {rob, not_rob};
}
int rob(TreeNode* root) {
auto [rob, not_rob] = dfs(root);
return max(rob, not_rob);
}
};
运行结果
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