[spidervirus]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new algorithms include a corresponding test class that validates their functionality.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

Description

Fixes #7746

In DistanceFormula.euclideanDistance, the variable dY was calculated using Math.pow(y2 - x1, 2) where x1 was incorrectly used instead of y1.

This PR:

1. Fixes dY to compute Math.pow(y2 - y1, 2).
2. Updates DistanceFormulaTest.java with the mathematically exact Euclidean distances.
3. Adds test cases covering zero distance, a 3-4-5 Pythagorean triangle, and negative coordinates.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.34%. Comparing base (c468089) to head (8368e91).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7747   +/-   ##
=========================================
  Coverage     82.34%   82.34%           
- Complexity     8446     8447    +1     
=========================================
  Files           843      843           
  Lines         26156    26156           
  Branches       5110     5110           
=========================================
+ Hits          21537    21539    +2     
+ Misses         3831     3830    -1     
+ Partials        788      787    -1     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[DenizAltunkapan]

@spidervirus thanks