Leetcode Problem 968. Binary Tree Cameras

968. Binary Tree Cameras

Leetcode Solutions

Perform a post-order traversal of the tree.
Use a recursive function that returns the state of a node (0, 1, or 2).
- State 0: Node is not covered by a camera.
- State 1: Node is covered by a camera, but does not have a camera itself.
- State 2: Node has a camera.
If any child of the current node is in state 0, place a camera at the current node and return state 2.
If any child of the current node is in state 2, return state 1 for the current node as it is covered.
If all children are in state 1, return state 0 as this node is not covered.
If the root node is in state 0, increment the camera count as it needs a camera.
Return the total number of cameras needed.

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