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21ed8968c0
* implement bidirectional astar * add type hints * add wikipedia url * format with black * changes from review * fix collision check * Add testmod() * # doctest: +NORMALIZE_WHITESPACE * Codespell: euclidean * Codespell: coordinates * Codespell: traversal * Codespell: remaining Co-authored-by: John Law <johnlaw.po@gmail.com> Co-authored-by: Christian Clauss <cclauss@me.com>
54 lines
1.1 KiB
Python
54 lines
1.1 KiB
Python
"""
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Tree_sort algorithm.
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Build a BST and in order traverse.
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"""
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class node:
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# BST data structure
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def __init__(self, val):
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self.val = val
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self.left = None
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self.right = None
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def insert(self, val):
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if self.val:
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if val < self.val:
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if self.left is None:
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self.left = node(val)
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else:
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self.left.insert(val)
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elif val > self.val:
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if self.right is None:
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self.right = node(val)
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else:
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self.right.insert(val)
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else:
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self.val = val
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def inorder(root, res):
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# Recursive traversal
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if root:
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inorder(root.left, res)
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res.append(root.val)
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inorder(root.right, res)
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def tree_sort(arr):
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# Build BST
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if len(arr) == 0:
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return arr
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root = node(arr[0])
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for i in range(1, len(arr)):
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root.insert(arr[i])
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# Traverse BST in order.
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res = []
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inorder(root, res)
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return res
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if __name__ == "__main__":
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print(tree_sort([10, 1, 3, 2, 9, 14, 13]))
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