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gh-94808: improve comments and coverage of fastsearch.h (GH-96760)

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Dennis Sweeney 2022-09-13 14:25:10 -04:00 • committed by GitHub
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Objects/stringlib/stringlib_find_two_way_notes.txt
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@ -239,7 +239,7 @@ We cut as AA + bAAbAAbA, and then the algorithm runs as follows:
~~ AA != bA at the cut
bbbAbbAAbAAbAAbbbAAbAAbAAbAA
AAbAAbAAbA
^^^^X 7-3=4 match, and the 5th misses.
^^^^X 7-3=4 match, and the 5th misses.
bbbAbbAAbAAbAAbbbAAbAAbAAbAA
AAbAAbAAbA
~ A != b at the cut
@ -395,7 +395,7 @@ of their proof goes something like this (this is far from complete):
needle == (a + w) + (w + b), meaning there's a bad equality
w == w, it's impossible for w + b to be bigger than both
b and w + w + b, so this can't happen. We thus have all of
the ineuqalities with no question marks.
the inequalities with no question marks.
* By maximality, the right part is not a substring of the left
part. Thus, we have all of the inequalities involving no
left-side question marks.