Add Longest Repeated Substring algorithm#7286
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DenizAltunkapan merged 2 commits intoTheAlgorithms:masterfrom Feb 22, 2026
Merged
Add Longest Repeated Substring algorithm#7286DenizAltunkapan merged 2 commits intoTheAlgorithms:masterfrom
DenizAltunkapan merged 2 commits intoTheAlgorithms:masterfrom
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Implement LongestRepeatedSubstring in the strings package using the existing SuffixArray and Kasai's algorithm for LCP array construction. Includes parameterized unit tests covering typical and edge cases.
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #7286 +/- ##
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+ Coverage 79.34% 79.37% +0.02%
- Complexity 7006 7021 +15
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Files 784 785 +1
Lines 22991 23019 +28
Branches 4516 4523 +7
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+ Hits 18242 18271 +29
Misses 4020 4020
+ Partials 729 728 -1 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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DenizAltunkapan
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Feb 22, 2026
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@caglareker Thank you for your contribution |
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Thank you for the review and merge. Happy to contribute. 🙏 |
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Summary
LongestRepeatedSubstringto thestringspackage, finding the longest substring that occurs at least twice in a given stringSuffixArray.buildSuffixArray()and adds Kasai's algorithm for LCP (Longest Common Prefix) array constructionWhy
This is a classic string algorithm commonly used in competitive programming, bioinformatics (DNA repeat detection), and data compression. It was a notable gap in the
stringspackage, especially given thatSuffixArraywas already available as a building block.Test plan
"banana"→"ana","mississippi"→"issi"), edge cases (null, empty string, single character, no repeats), and direct LCP array verification