Leetcode Problem 331. Verify Preorder Serialization of a Binary Tree

331. Verify Preorder Serialization of a Binary Tree

Leetcode Solutions

Slot Counting Approach

  1. Initialize slots to 1, representing the slot for the root node.
  2. Split the preorder string by commas to process each node.
  3. Iterate over the nodes: a. Decrement slots by 1 because each node (null or not) occupies one slot. b. If slots is negative at any point, return false as this indicates more nodes than slots. c. If the current node is not null (not a '#'), increment slots by 2 for the child nodes.
  4. After processing all nodes, check if slots is 0. If so, return true; otherwise, return false.
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Stack Based Approach

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