Easy
Quiz
#144 Binary Tree Preorder Traversal
APPROACH
Given the root of a binary tree, return its node values collected in preorder (root, then left subtree, then right subtree).
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What is the optimal approach for this problem?
#144 Binary Tree Preorder Traversal
APPROACH
Given the root of a binary tree, return its node values collected in preorder (root, then left subtree, then right subtree).
What is the optimal approach for this problem?