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D_print_nodes_at_k_distance.py
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D_print_nodes_at_k_distance.py
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class Node:
def __init__(self, data):
self.data = data
self.left = None
self.right = None
def printkDistanceNodeDown(root, k):
if root is None or k < 0:
return
if k == 0:
return root.data
printkDistanceNodeDown(root.left, k - 1)
printkDistanceNodeDown(root.right, k - 1)
def printkDistanceNode(root, target, k):
if root is None:
return -1
if root == target:
printkDistanceNodeDown(root, k)
return 0
dl = printkDistanceNode(root.left, target, k)
if dl != -1:
if dl + 1 == k:
return root.data
else:
printkDistanceNodeDown(root.right, k - dl - 2)
return 1 + dl
dr = printkDistanceNode(root.right, target, k)
if dr != -1:
if dr + 1 == k:
return root.data
else:
printkDistanceNodeDown(root.left, k - dr - 2)
return 1 + dr
return -1
if __name__ == "__main__":
"""
from timeit import timeit
root = Node(20)
root.left = Node(8)
root.right = Node(22)
root.left.left = Node(4)
root.left.right = Node(12)
root.left.right.left = Node(10)
root.left.right.right = Node(14)
target = root.left.right
print(timeit(lambda: printkDistanceNode(root, target, 2), number=10000)) # 0.01410139200015692
"""