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Tarunj Gupta
1644db2a34 Add Count Nice Subarrays sliding using window algorithm (#7206) 
* Add Count Nice Subarrays sliding window algorithm

* Add detailed comments and reference to CountNiceSubarrays

* Fix clang-format issues in CountNiceSubarrays

* Added extra edge cases

* changes made
 2026-01-10 16:32:19 +01:00
Ahmed Allam
fe6066b332 Add SmoothSort (Dijkstra’s adaptive in-place heapsort variant) (#7200) 
* feat: implement Smooth Sort algorithm with detailed JavaDoc and test class

* style: format LEONARDO array for improved readability with clang-format

---------

Co-authored-by: Ahmed Allam <60698204+AllamF5J@users.noreply.github.com>
 2026-01-09 12:36:46 +01:00
dependabot[bot]
ca4bebcbd5 chore(deps): bump peter-evans/create-pull-request from 7 to 8 in /.github/workflows (#7199) 
chore(deps): bump peter-evans/create-pull-request in /.github/workflows

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 7 to 8.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](https://github.com/peter-evans/create-pull-request/compare/v7...v8)

---
updated-dependencies:
- dependency-name: peter-evans/create-pull-request
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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 2026-01-08 09:56:14 +01:00
Rajesh Reddy
938d06abb5 docs: clarify hash map vs HashMap terminology (#7195) 2026-01-07 12:49:51 +01:00
dependabot[bot]
404e1404aa chore(deps): bump org.junit:junit-bom from 6.0.1 to 6.0.2 (#7194) 
Bumps [org.junit:junit-bom](https://github.com/junit-team/junit-framework) from 6.0.1 to 6.0.2.
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](https://github.com/junit-team/junit-framework/compare/r6.0.1...r6.0.2)

---
updated-dependencies:
- dependency-name: org.junit:junit-bom
  dependency-version: 6.0.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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 2026-01-06 22:38:42 +01:00
dependabot[bot]
c06c0f03e3 chore(deps): bump com.puppycrawl.tools:checkstyle from 12.3.1 to 13.0.0 (#7193) 
Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 12.3.1 to 13.0.0.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](https://github.com/checkstyle/checkstyle/compare/checkstyle-12.3.1...checkstyle-13.0.0)

---
updated-dependencies:
- dependency-name: com.puppycrawl.tools:checkstyle
  dependency-version: 13.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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 2026-01-05 22:50:29 +01:00
Giridharan S
24389c06a2 Add detailed JavaDoc for AllPathsFromSourceToTarget algorithm (#7192) 
Add detailed JavaDoc for AllPathsFromSourceToTarget
 2026-01-05 17:10:24 +01:00
dependabot[bot]
e945f16224 chore(deps): bump com.puppycrawl.tools:checkstyle from 12.3.0 to 12.3.1 (#7188) 
Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 12.3.0 to 12.3.1.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](https://github.com/checkstyle/checkstyle/compare/checkstyle-12.3.0...checkstyle-12.3.1)

---
updated-dependencies:
- dependency-name: com.puppycrawl.tools:checkstyle
  dependency-version: 12.3.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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 2026-01-01 18:23:45 +01:00
Deniz Altunkapan
0eda2a1db8 Add test requirement to pull request template (#7185) 
* Add checklist item for test class inclusion

* Update pull request template for algorithm tests
 2025-12-29 21:55:23 +01:00
Deniz Altunkapan
6149ec7fed Update DIRECTORY.md (#7093) 
Co-authored-by: DenizAltunkapan <DenizAltunkapan@users.noreply.github.com>
 2025-12-29 17:06:23 +02:00
Patil Arpita
35556fe1f1 Added 0/1 Knapsack Algorithm using Dynamic Programming in Java (#6789) 
* Added 0/1 Knapsack Algorithm using Dynamic Programming in Java

* Fix Checkstyle whitespace issues in Knapsack.java

* Formatted Knapsack.java to pass linter and added 0/1 Knapsack algorithm

* Formatted Knapsack.java to pass linter and added 0/1 Knapsack algorithm

* Formatted Knapsack.java to pass linter and added 0/1 Knapsack algorithm

* Formatted Knapsack.java to pass linter and added 0/1 Knapsack algorithm

---------

Co-authored-by: Deniz Altunkapan <deniz.altunkapan@outlook.com>
 2025-12-29 14:27:31 +01:00
Daniel Sánchez Núñez
d382e656f2 Adding method to check wether a matrix is stochastic (#7184) 
* Add StochasticMatrix utility class

This class provides methods to check if a matrix is row-stochastic or column-stochastic, ensuring all elements are non-negative and the sums of rows or columns equal 1.

* Change package from maths to matrix

Updated package declaration for StochasticMatrix class.

* Change package declaration in StochasticMatrixTest

* Delete src/test/java/com/thealgorithms/StochasticMatrixTest.java

* Refactor matrix initialization for test cases

* Fix formatting of matrix initialization in tests

* Remove unnecessary newline in StochasticMatrix

* Add import statement for JUnit in StochasticMatrixTest

* Add additional assertions to StochasticMatrixTest

* Clean up import statements in StochasticMatrixTest

Removed unused import statements for cleaner code.

* Reorder import statements in StochasticMatrixTest

* Remove unused import assertThrows from StochasticMatrixTest

Removed unused import for assertThrows.
 2025-12-28 10:53:12 +01:00
NYAMATHABAD KOUSHIK SAI
51335cc18a Add Immutable HashMap implementation (#7183) 
* Add immutable HashMap implementation

* Add immutable HashMap implementation

* Applied clang-format

---------

Co-authored-by: Koushik Sai <nyamathabadkoushik@gmail.com>
 2025-12-27 16:55:23 +00:00
NYAMATHABAD KOUSHIK SAI
2707da25e3 Add recursive factorial implementation with tests (#7178) 
* Add recursive factorial implementation with tests

* [STYLE] Apply clang-format

* Move recursive factorial to recursion package and remove duplicate

* Move recursive factorial to recursion package and remove duplicate

* Apply clang-format to factorial recursion tests

* Apply clang-format to factorial recursion tests

---------

Co-authored-by: Koushik Sai <nyamathabadkoushik@gmail.com>
Co-authored-by: Deniz Altunkapan <deniz.altunkapan@outlook.com>
 2025-12-22 20:15:50 +00:00
HxCodes
1eb0d61730 Improve documentation and inline comments for QuickSort algorithm (#7182) 
* Improve QuickSort documentation with detailed comments and explanations

* Format QuickSort documentation and fix JavaDoc layout
 2025-12-21 16:33:25 +01:00
Gopal Gupta
bb334881e9 Implement LengthOfLastWord algorithm and add JUnit tests (#7057) 
* Implement LengthOfLastWord algorithm in strings package

* Add JUnit tests for LengthOfLastWord algorithm

* style: fix import order and spacing for clang-format
 2025-12-20 13:42:34 +00:00
Adityaraj Solanki
48e02b3bac Add input validation for negative values in FibonacciSeries (#7177) 2025-12-18 17:09:55 +01:00
Saniya Mane
7d51c7f320 Add additional edge cases to GCD unit tests (#7174) 
* Add additional edge cases to GCD unit tests

* Rename GCD test methods and add descriptive names

* Fix formatting in GCD tests

---------

Co-authored-by: Deniz Altunkapan <deniz.altunkapan@outlook.com>
 2025-12-18 07:55:03 +00:00
Rajuri Likhitha
2911a7b52c ExtendedEuclideanAlgorithm (#7172) 
* commit1

* Fix clang-format spacing in array declarations
 2025-12-17 22:14:12 +01:00
NYAMATHABAD KOUSHIK SAI
4f293b33e5 [FEAT] Add Thin Lens formula for ray optics (#7170) 
* [FEAT] Add Thin Lens formula for ray optics

* [CI] Re-run clang-format checks

* [CI] Re-run checks after rebase

* [STYLE] Apply clang-format to ThinLensTest

---------

Co-authored-by: Koushik Sai <nyamathabadkoushik@gmail.com>
 2025-12-17 16:48:00 +01:00
dependabot[bot]
b76962d5ad chore(deps): bump com.puppycrawl.tools:checkstyle from 12.2.0 to 12.3.0 (#7167) 
Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 12.2.0 to 12.3.0.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](https://github.com/checkstyle/checkstyle/compare/checkstyle-12.2.0...checkstyle-12.3.0)

---
updated-dependencies:
- dependency-name: com.puppycrawl.tools:checkstyle
  dependency-version: 12.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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 2025-12-16 17:53:29 +01:00
Taranjeet Singh Kalsi
d9f2ac8340 Added program to check Lucky number (#6962) 
added program for lucky number
 2025-12-14 10:29:14 +00:00
Muhammad Junaid Khalid
aa91451203 feat: Binary Tree to String algorithm added (Leetcode 606) (#6727) 
* feat: BinaryTreeToString.java Added with tests

* fix: javadoc added to BinaryTreeToString

* fix: link to leetcode added
 2025-12-14 10:14:00 +00:00
utkarsh patel
bccaf970ba Add Z-Algorithm for Linear-Time String Pattern Matching (#7124) 
* Add Z-Algorithm (string pattern matching) with tests

* Add Z-Algorithm (string pattern matching) with tests

* Add Z-Algorithm (string pattern matching) with tests

* Fix checkstyle errors for ZAlgorithm

* Fix: clang-format and checkstyle compliance for ZAlgorithm
 2025-12-14 10:08:18 +00:00
dependabot[bot]
746457ce15 chore(deps): bump actions/cache from 4 to 5 in /.github/workflows (#7162) 
Bumps [actions/cache](https://github.com/actions/cache) from 4 to 5.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](https://github.com/actions/cache/compare/v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
 2025-12-13 00:29:17 +01:00
dependabot[bot]
a8bc9cc525 chore(deps-dev): bump org.mockito:mockito-core from 5.20.0 to 5.21.0 (#7154) 
Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 5.20.0 to 5.21.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](https://github.com/mockito/mockito/compare/v5.20.0...v5.21.0)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-version: 5.21.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Co-authored-by: Deniz Altunkapan <deniz.altunkapan@outlook.com>
 2025-12-10 10:33:35 +00:00
Lucas Horn
4f40206684 Add unit tests for graph algorithms (#7133) (#7156) 
* Add unit tests for graph algorithms (BFS, DFS, Dijkstra, Bellman-Ford) #7133

- Created BellmanFordTest.java with 10 test methods covering various graph scenarios

- Created ConnectedComponentTest.java with 15 test methods for DFS-based component counting

- Enhanced MatrixGraphsTest.java with additional BFS/DFS test cases

- Enhanced DijkstraAlgorithmTest.java with comprehensive shortest path tests

Fixes #7133

* fix: format files using clang

* fix: removing my changes on pull_request_template

---------

Co-authored-by: prashantdubeypng <vinoddubey6059@gmail.com>
 2025-12-10 09:04:32 +00:00
codeahl
520151ab8e Add Big-O time and space complexity comments for sorting algorithms (#7155) 
Add time and space complexity comments for specific sorting algorithms

Co-authored-by: Deniz Altunkapan <deniz.altunkapan@outlook.com>
 2025-12-10 10:00:28 +01:00
dependabot[bot]
e7c3e1f773 chore(deps): bump com.mebigfatguy.fb-contrib:fb-contrib from 7.7.1 to 7.7.2 (#7153) 
chore(deps): bump com.mebigfatguy.fb-contrib:fb-contrib

Bumps [com.mebigfatguy.fb-contrib:fb-contrib](https://github.com/mebigfatguy/fb-contrib) from 7.7.1 to 7.7.2.
- [Commits](https://github.com/mebigfatguy/fb-contrib/commits/v7.7.2)

---
updated-dependencies:
- dependency-name: com.mebigfatguy.fb-contrib:fb-contrib
  dependency-version: 7.7.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
 2025-12-09 09:43:17 +01:00
Daniel Sánchez Núñez
316def4ea6 Add Snell's Law refraction algorithm (#7150) 
* Add Snell's Law implementation for refraction angle

* Add tests for Snell's Law calculations

* Update documentation with reference link to Snell's Law

Added a reference link to Snell's Law in the documentation.

* Prevent instantiation of SnellLaw class

Make SnellLaw class non-instantiable by adding a private constructor.

* Rename SnellsLawTest to SnellLawTest

* Refactor SnellLawTest for clarity and accuracy

* Rename SnellsLaw.java to SnellLaw.java

* Refactor SnellLawTest with additional assertions

* Refactor SnellLaw class constructor and error handling

Refactor SnellLaw constructor and error message formatting.

* Fix missing newline at end of SnellLawTest.java

Ensure that the SnellLawTest class has a newline at the end of the file.

* Simplify assertions in SnellLawTest

* Simplify exception throwing for total internal reflection
 2025-12-07 12:18:55 +01:00
espinosadev
246162e5bd Fixed redundant boolean logic (#7151) 2025-12-05 16:45:25 +01:00
dependabot[bot]
bd7f269aa9 chore(deps): bump gitpod/workspace-java-21 from 2025-10-06-13-14-25 to 2025-11-14-10-05-32 (#7148) 
chore(deps): bump gitpod/workspace-java-21

Bumps gitpod/workspace-java-21 from 2025-10-06-13-14-25 to 2025-11-14-10-05-32.

---
updated-dependencies:
- dependency-name: gitpod/workspace-java-21
  dependency-version: 2025-11-14-10-05-32
  dependency-type: direct:production
...

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 2025-12-02 08:58:42 +00:00
dependabot[bot]
927fe1f87c chore(deps): bump com.puppycrawl.tools:checkstyle from 12.1.2 to 12.2.0 (#7147) 
Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 12.1.2 to 12.2.0.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](https://github.com/checkstyle/checkstyle/compare/checkstyle-12.1.2...checkstyle-12.2.0)

---
updated-dependencies:
- dependency-name: com.puppycrawl.tools:checkstyle
  dependency-version: 12.2.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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 2025-12-02 09:54:59 +01:00
duvvuvenkataramana
8d2cdb27db feat: implement One-Time Pad cipher (#6941) (#7096) 
* feat: implement One-Time Pad cipher (#6941)

* style: format OneTimePadCipher with clang-format
 2025-12-01 20:17:32 +00:00
Shewale Gopal Sanjay
14c0b0844e Added threaded binary tree (#6995) 
* Add One-Time Pad Cipher implementation in Java

* Add One-Time Pad Cipher implementation (fixed)

* Add ThreadedBinaryTree with in-order traversal and tests

* feat: add threaded binary tree implementation and tests

* fix: remove redundant null check for SpotBugs compliance
 2025-12-01 20:13:14 +00:00
Taranjeet Singh Kalsi
ac6fef19dc Added program to check either number is Evil or Odious (#6958) 
added program for evil number
 2025-11-30 22:37:41 +00:00
Taranjeet Singh Kalsi
a9ba87c4b6 Added program to check Abundant number (#6961) 
added program for abundant number
 2025-11-28 08:51:28 +00:00
Sameer Prajapati
4c5525a2e0 feat: Added Gomory–Hu Tree (all-pairs min-cuts via n1 max-flows) (#6818) 
* Add Gomory–Hu Tree (all-pairs min-cuts via n1 max-flows)

* Stabilize Monte Carlo integration with antithetic variates to reduce variance

* Fix Checkstyle in GomoryHuTreeTest: remove inner assignments, add braces, split declarations

* SpotBugs: use RandomGenerator interface in test helper

---------

Co-authored-by: Deniz Altunkapan <deniz.altunkapan@outlook.com>
 2025-11-28 08:47:53 +00:00
dependabot[bot]
f352f8111b chore(deps): bump com.mebigfatguy.fb-contrib:fb-contrib from 7.7.0 to 7.7.1 (#7144) 
chore(deps): bump com.mebigfatguy.fb-contrib:fb-contrib

Bumps [com.mebigfatguy.fb-contrib:fb-contrib](https://github.com/mebigfatguy/fb-contrib) from 7.7.0 to 7.7.1.
- [Commits](https://github.com/mebigfatguy/fb-contrib/commits)

---
updated-dependencies:
- dependency-name: com.mebigfatguy.fb-contrib:fb-contrib
  dependency-version: 7.7.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
 2025-11-28 09:26:07 +01:00
Gokul45-45
d1ea306920 feat: add Valid Parentheses algorithm using Stack (#7117) 
* feat: add Valid Parentheses algorithm using Stack

* fix: add missing ValidParentheses.java implementation

* fix: remove trailing spaces and add newline at EOF

* fix: remove misplaced ValidParentheses.java from root
 2025-11-27 11:29:48 +00:00
Jayana Anjani Pavan Vardhan Naidu
e841d73837 Update Javadoc for perimeterIrregularPolygon method (#7141) 
Fixed incorrect @return description in perimeterIrregularPolygon method javadoc. Changed "trapezoid" to "irregular polygon" to accurately reflect what the method calculates.
 2025-11-27 12:25:52 +01:00
prasanth-30011
a14e1e3766 docs: improve javadoc for Combination class (#7126) 
Updated class documentation to reflect that the class finds combinations instead of permutations.
 2025-11-26 12:21:07 +01:00
dependabot[bot]
2c4bf3c7c8 chore(deps): bump com.github.spotbugs:spotbugs-maven-plugin from 4.9.8.1 to 4.9.8.2 (#7109) 
chore(deps): bump com.github.spotbugs:spotbugs-maven-plugin

Bumps [com.github.spotbugs:spotbugs-maven-plugin](https://github.com/spotbugs/spotbugs-maven-plugin) from 4.9.8.1 to 4.9.8.2.
- [Release notes](https://github.com/spotbugs/spotbugs-maven-plugin/releases)
- [Commits](https://github.com/spotbugs/spotbugs-maven-plugin/compare/spotbugs-maven-plugin-4.9.8.1...spotbugs-maven-plugin-4.9.8.2)

---
updated-dependencies:
- dependency-name: com.github.spotbugs:spotbugs-maven-plugin
  dependency-version: 4.9.8.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
 2025-11-25 16:36:37 +01:00
Eswar Venkata Ram Charan Seeram
1c6026ecc6 fix: correct error message in surfaceAreaCylinder method (#7106) 2025-11-24 21:16:16 +01:00
Deniz Altunkapan
f693c44b53 fix: prevent duplicate auth header in GitHub Actions workflow (#7091) 2025-11-22 19:26:16 +02:00
KANAKALA SAI KIRAN
fa8ea8e614 Feature/centroid decomposition (#7086) 
* feat: Add Centroid Decomposition for trees (#7054)

- Implement CentroidDecomposition with O(N log N) construction
- Add CentroidTree class with parent tracking and query methods
- Include buildFromEdges helper for easy tree construction
- Add comprehensive test suite with 20+ test cases
- Cover edge cases, validation, and various tree structures

Closes #7054

* feat: Add Centroid Decomposition for trees (#7054)

- Implement CentroidDecomposition with O(N log N) construction
- Add CentroidTree class with parent tracking and query methods
- Include buildFromEdges helper for easy tree construction
- Add comprehensive test suite with 20+ test cases
- Cover edge cases, validation, and various tree structures

Closes #7054

* fix: Remove trailing whitespace from CentroidDecompositionTest

* fix: Remove trailing whitespace and add newlines at end of files

* fix: Format code to comply with clang-format and checkstyle requirements

* style: Fix lambda formatting in test assertions

- Change single-line lambdas to multi-line format
- Align with repository code style guidelines

* style: Apply clang-format to match repository style guide

- Format code according to .clang-format configuration
- Use single-line lambdas as allowed by AllowShortLambdasOnASingleLine: All
- Apply 4-space indentation
- Ensure proper line endings
 2025-11-22 09:44:34 +00:00
dependabot[bot]
e6c576c50a chore(deps): bump actions/checkout from 5 to 6 in /.github/workflows (#7084) 
Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
 2025-11-20 19:44:44 +01:00
Piotr Idzik
fba6292ebc chore: pin infer to more recent hash (#7079) 
* chore: pin infer to more recent hash

* chore: suppress new infer warnings
 2025-11-19 19:31:32 +01:00
Deniz Altunkapan
e37a7ab6ce Update DIRECTORY.md (#7070) 
Co-authored-by: alxkm <alxkm@users.noreply.github.com>
 2025-11-19 18:25:09 +02:00
shreeya-g10
3519e396af backtracking: add unique permutation algorithm with test cases (#7078) 
* Add unique permutation algorithm and test cases

* Fix: add braces for checkstyle

* Apply clang-format
 2025-11-19 18:20:46 +02:00