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AQA A’Level Tree traversal algorithms

Computing#Computer#Science#OCR#Tree Traversal#Algorithm
14K views|6 years ago
💫 Short Summary

The video explains three tree traversal algorithms - pre-order, in-order, and post-order - each visiting the root node in a different sequence. Pre-order goes root, left, right, in-order follows left nodes first for inherent sequence, and post-order visits the root last. In-order is useful for sorting binary search tree values alphabetically. Post-order involves placing markers to output values correctly after traversing left and right subtrees. All algorithms are similar with slight variations in root visitation. By following markers, correct output can be achieved.

✨ Highlights
📊 Transcript
Three variations of tree traversal algorithms - pre-order, in-order, and post-order are demonstrated.
Pre-order traversal starts from the root and moves left, then right, outputting data along the way.
In-order traversal retrieves data based on inherent sequence by visiting left nodes first.
Post-order traversal visits the root last, following a bottom-up approach.
In-order traversal is highlighted for its ability to output data in alphabetical order, showcasing its usefulness in sorting binary search tree values.
Post-order traversal in binary trees involves outputting values after traversing left and right subtrees.
The process includes placing markers and following with a pen to ensure values are outputted correctly.
Different types of tree traversals are very similar, with slight variations in visiting roots at different points.
By following the markers accurately, the correct output for the traversal method can be achieved.