Created
April 14, 2022 10:04
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| // root | left | right | |
| func preOrderTraverse(_ root: Node?) { | |
| if let root = root { | |
| print(root.value, terminator: " ") | |
| preOrderTraverse(root.left) | |
| preOrderTraverse(root.right) | |
| } | |
| } | |
| preOrderTraverse(node_1) |
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