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Dev.to
Dev.to
7/3/2026
Binary Tree - Morris InOrder Traversal

Binary Tree - Morris InOrder Traversal

Short summary

Morris Inorder Traversal is an advanced algorithm technique that traverses binary trees in-order without using recursion or explicit stack data structures, achieving optimal O(1) space complexity. It works by temporarily creating and removing threads (links) from inorder predecessor nodes back to the current node, allowing the algorithm to navigate the tree while maintaining its original structure. This space-efficient approach is particularly valuable for memory-constrained systems and is a classic topic in coding interviews and competitive programming.

  • O(1) space traversal without recursion or stack using temporary threading links
  • Algorithm temporarily modifies tree structure during traversal, then restores it unchanged
  • Essential technique for memory-constrained systems and technical coding interviews

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