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LeetCode-Solutions/Python/binary-tree-pruning.py at master · pythonpeixun/LeetCode-Solutions · GitHub
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LeetCode-Solutions
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Python
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binary-tree-pruning.py
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LeetCode-Solutions
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Python
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binary-tree-pruning.py
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# Time: O(n)
# Space: O(h)
class
Solution
(
object
):
def
pruneTree
(
self
,
root
):
"""
:type root: TreeNode
:rtype: TreeNode
"""
if
not
root
:
return
None
root
.
left
=
self
.
pruneTree
(
root
.
left
)
root
.
right
=
self
.
pruneTree
(
root
.
right
)
if
not
root
.
left
and
not
root
.
right
and
root
.
val
==
0
:
return
None
return
root
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