What is the time complexity of pre-order traversal in the iterative fashion?

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• Consider the following data. The pre order traversal of a binary tree is A, B, E, C, D. The in order traversal of the same binary tree is B, E, A, D, C. The level order sequence for the binary tree is
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• What is the time complexity of level order traversal?
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• The data structure required for Breadth First Traversal on a graph is?
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