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do_lists_overlap.py
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do_lists_overlap.py
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import functools
from typing import Optional
from list_node import ListNode
from test_framework import generic_test
from test_framework.test_failure import TestFailure
from test_framework.test_utils import enable_executor_hook
def overlapping_lists(l0: ListNode, l1: ListNode) -> Optional[ListNode]:
# TODO - you fill in here.
return None
@enable_executor_hook
def overlapping_lists_wrapper(executor, l0, l1, common, cycle0, cycle1):
if common:
if not l0:
l0 = common
else:
it = l0
while it.next:
it = it.next
it.next = common
if not l1:
l1 = common
else:
it = l1
while it.next:
it = it.next
it.next = common
if cycle0 != -1 and l0:
last = l0
while last.next:
last = last.next
it = l0
for _ in range(cycle0):
if not it:
raise RuntimeError('Invalid input data')
it = it.next
last.next = it
if cycle1 != -1 and l1:
last = l1
while last.next:
last = last.next
it = l1
for _ in range(cycle1):
if not it:
raise RuntimeError('Invalid input data')
it = it.next
last.next = it
common_nodes = set()
it = common
while it and id(it) not in common_nodes:
common_nodes.add(id(it))
it = it.next
result = executor.run(functools.partial(overlapping_lists, l0, l1))
if not (id(result) in common_nodes or (not common_nodes and not result)):
raise TestFailure('Invalid result')
if __name__ == '__main__':
exit(
generic_test.generic_test_main('do_lists_overlap.py',
'do_lists_overlap.tsv',
overlapping_lists_wrapper))