Solution: Binary Tree Level Order Traversal
Let's solve the Binary Tree Level Order Traversal problem using the Tree Breadth-first Search pattern.
Statement
Given the root of a binary tree, display the values of its nodes while performing a level order traversal. Return the node values for all levels in a string separated by the character :
. If the tree is empty, i.e., the number of nodes is , then return “None” as the output.
Constraints:
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The number of nodes in the tree is in the range .
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Node.data
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