Created
January 2, 2017 00:23
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Binary Tree Inorder
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| def binary_tree_inorder(root): | |
| res = [] | |
| if root: | |
| helper(root, res) | |
| return res | |
| def helper(root, res): | |
| if root: | |
| helper(root.left, res) | |
| res.appned(root.val) | |
| helper(root.right, res) | |
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why "if root" again in helper function?