Binary tree traversal DFS BFS
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Binary tree traversal
DFS
preorder
Root first, then left subtree, and then right subtree.

inorder
Left subtree first, then root, and then right subtree.

postorder
Left subtree first, then right subtree, and then root.

BFS
level order traversal
Start from root node and traverse its neighbours, and its second level neighbours and so on.

