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You don't need to create list or array while doing inorder traversal. The whole point is to compare current and last element, if last elment is greater or equal to current return false. Just use one wrapper int, or Integer static variable to keep track of last visited.
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You don't need to create list or array while doing inorder traversal. The whole point is to compare current and last element, if last elment is greater or equal to current return false. Just use one wrapper int, or Integer static variable to keep track of last visited.