1. You are given a partially written function to solve. 2. 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. 3. Input and Output is managed for you.
Input Format
Input is managed for you.
Output Format
Output is managed for you.
Constraints
0 <= Number of Nodes <= 10^9 -10^9 <= value of Node data <= 10^9
Notice
Try First, Check Solution later
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Input
15 1 1 -1 1 1 -1 1 -1 -1 1 -1 -1 1 -1 -1
Output
4