Leetcode Problem 1609. Even Odd Tree

1609. Even Odd Tree

Leetcode Solutions

BFS Level-Order Traversal

  1. Initialize a queue and add the root node to it.
  2. Initialize a variable level to keep track of the current level index.
  3. While the queue is not empty: a. Record the size of the queue, which represents the number of nodes at the current level. b. Initialize a variable prev to keep track of the previous node's value. c. Iterate over the nodes at the current level: i. For even-indexed levels, check if the current node's value is odd and strictly greater than prev. ii. For odd-indexed levels, check if the current node's value is even and strictly less than prev. iii. If any condition fails, return false. iv. Update prev to the current node's value. v. Add the current node's children to the queue. d. Increment level.
  4. If all levels satisfy the conditions, return true.
UML Thumbnail

Recursive DFS with Level Tracking

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