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Optimize linked-list loop detection #15577

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Optimize linked-list loop detection #15577

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13 changes: 8 additions & 5 deletions data_structures/linked_list/has_loop.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,11 +37,14 @@ def has_loop(self) -> bool:
>>> root_node.has_loop
True
"""
try:
list(self)
return False
except ContainsLoopError:
return True
slow_node = self
fast_node = self
while fast_node and fast_node.next_node:
slow_node = slow_node.next_node
fast_node = fast_node.next_node.next_node
if slow_node is fast_node:
return True
return False


if __name__ == "__main__":
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