Tree Construction
With unique keys, inorder plus preorder, or inorder plus postorder, determines the tree. The root comes from the preorder or postorder, and inorder splits the children.
Costs
| Category | Algorithm |
| Difficulty | Medium |
| Build with a hash map of inorder indexes | O(n) |
| Inorder alone | not enough |
| Preorder alone | not enough |
Questions
What is Tree Construction?
With unique keys, inorder plus preorder, or inorder plus postorder, determines the tree. The root comes from the preorder or postorder, and inorder splits the children.
Where do I practice it?
DSA Master keeps challenges and progress on the phone. This page is the idea and the costs.