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Does this pass the case where head is null? I'm not a Python guy, but in Java or Javascript, while start.next will throw a null reference exception in that case. Perhaps Python just treats that as a false case and moves on.
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Does this pass the case where head is null? I'm not a Python guy, but in Java or Javascript, while start.next will throw a null reference exception in that case. Perhaps Python just treats that as a false case and moves on.