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Add regression doctests for KMP search and failure arrays #15546

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Add regression doctests for KMP search and failure arrays #15546

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9 changes: 9 additions & 0 deletions strings/knuth_morris_pratt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,10 @@ def knuth_morris_pratt(text: str, pattern: str) -> int:
... for s in ("kn", "h_m", "rr", "tt", "not there")
... )
True
>>> knuth_morris_pratt("abc", "")
0
>>> knuth_morris_pratt("", "")
0
"""

# 1) Construct the failure array
Expand Down Expand Up @@ -47,6 +51,11 @@ def get_failure_array(pattern: str) -> list[int]:
Calculates the new index we should go to if we fail a comparison
:param pattern:
:return:

>>> get_failure_array("abc")
[0, 0, 0]
>>> get_failure_array("aabaabaaa")
[0, 1, 0, 1, 2, 3, 4, 5, 2]
"""
failure = [0]
i = 0
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