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VeraSa C17 Otters #91

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VeraSa C17 Otters #91

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17 changes: 16 additions & 1 deletion linked_lists/intersection.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,4 +11,19 @@ def intersection_node(headA, headB):
""" Will return the node at which the two lists intersect.
If the two linked lists have no intersection at all, return None.
"""
pass
if not headA or not headB:
return None

a = headA
b = headB

while a != b:
if a:
a = a.next
else:
a = headB
if b:
b = b.next
else:
b = headA
return a