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feat: add Valid Parentheses algorithm using Stack #7117

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Merged
merged 5 commits into from
Nov 27, 2025
Merged

feat: add Valid Parentheses algorithm using Stack #7117

merged 5 commits into from
Nov 27, 2025
+106 −0

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@Gokul45-45
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@Gokul45-45 Gokul45-45 commented Nov 25, 2025

Description

This PR adds the Valid Parentheses algorithm implementation using Stack data structure.

Problem

Checks if a string containing parentheses (), brackets [], and braces {} is valid according to:

  • Open brackets must be closed by the same type
  • Open brackets must be closed in the correct order

Changes Made

  • Added ValidParentheses.java in stacks package
  • Added comprehensive unit tests in ValidParenthesesTest.java
  • Includes edge case handling (null, odd length, empty string)

Testing

  • All tests pass locally
  • Covers valid cases: (), ()[]{}, {[]}
  • Covers invalid cases: (], ([)], {{{

Closes #6724

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codecov-commenter commented Nov 25, 2025 •
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Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.50%. Comparing base (e841d73) to head (335732e).

Files with missing lines Patch % Lines
...ava/com/thealgorithms/stacks/ValidParentheses.java 87.50% 1 Missing and 1 partial ⚠️
Additional details and impacted files 
@@             Coverage Diff              @@
##             master    #7117      +/-   ##
============================================
- Coverage     78.50%   78.50%   -0.01%     
- Complexity     6752     6757       +5     
============================================
  Files           759      760       +1     
  Lines         22402    22418      +16     
  Branches       4400     4404       +4     
============================================
+ Hits          17587    17599      +12     
- Misses         4109     4111       +2     
- Partials        706      708       +2

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@Gokul45-45
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Gokul45-45 commented Nov 25, 2025

@DenizAltunkapan
could u please check and review the changes ,i would appereciate a quick response
,thank you!!

@DenizAltunkapan DenizAltunkapan enabled auto-merge (squash) November 27, 2025 11:27
@DenizAltunkapan DenizAltunkapan merged commit d1ea306 into TheAlgorithms:master Nov 27, 2025
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@DenizAltunkapan DenizAltunkapan DenizAltunkapan approved these changes

@yanglbme yanglbme Awaiting requested review from yanglbme yanglbme is a code owner

@alxkm alxkm Awaiting requested review from alxkm alxkm is a code owner

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Valid Parenthesis using Java

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@Gokul45-45 @codecov-commenter @DenizAltunkapan