968. Binary Tree Cameras LeetCode Solution | Easy Approach

Minimum Cost to Merge Stones

Binary Tree Cameras You are given the root of a binary tree. We install cameras on the tree nodes where each camera at a node can monitor its parent, itself, and its immediate children.

Return the minimum number of cameras needed to monitor all nodes of the tree.

Example 1:

Input: root = [0,0,null,0,0]
Output: 1
Explanation: One camera is enough to monitor all nodes if placed as shown.

Example 2:

Input: root = [0,0,null,0,null,0,null,null,0]
Output: 2
Explanation: At least two cameras are needed to monitor all nodes of the tree. The above image shows one of the valid configurations of camera placement.


  • The number of nodes in the tree is in the range [1, 1000].
  • Node.val == 0

Binary Tree Cameras Solutions

Time: O(n)
Space: O(n)


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