Implemented LeetCode Problem #337 - House Robber III in C++ using Tree DP #3034
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This PR adds a C++ solution for LeetCode Problem #337 - House Robber III
Approach: Dynamic Programming (Tree DP) using Post-order DFS
Each node computes two states:
Time Complexity: O(n), where n = number of nodes
Space Complexity: O(h), where h = height of the tree
The code includes detailed inline comments and explanation of the approach,
making it easy to understand and reusable for similar tree DP problems.
Optional test case is included but commented out for safe submission.