[RuslanLomaka]

Summary

• Adds the "Kth Largest Element" problem to the Heaps topic (previously empty), following the classic "Kth Largest Element in an Array" formulation: findKthLargest(int[] numbers, int k) returns the kth largest value (k = 1 is the largest), with duplicates counted individually.
• Registers KthLargestElementProblem in ProblemRegistry alongside the existing problems.
• Adds reference solutions at src/test/resources/solutions/kth-largest-element.txt (min-heap of size k) and kth-largest-element.wrong.txt (returns the kth smallest via sorting, which fails multiple hidden tests on purpose).
• Bumps ProblemRegistryTest's hasSize(...) assertion from 8 to 9 registered problems.

Only these files were touched: the new problem class, ProblemRegistry.java, the two solution files, and ProblemRegistryTest.java.

Test plan

Ran the scoped, Docker-free validation command (also runs Checkstyle in Maven's validate phase):

$ ./mvnw test -Dtest=HarnessVerificationTest,ProblemDefinitionContractTest,ProblemRegistryTest
...
[INFO] --- checkstyle:3.6.0:check (checkstyle-validate) @ OnlineJava ---
[INFO] You have 0 Checkstyle violations.
...
[INFO] Tests run: 7, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.173 s -- in com.example.onlinejava.problem.ProblemRegistryTest
[INFO] Tests run: 18, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 8.170 s -- in com.example.onlinejava.problem.HarnessVerificationTest
[INFO] Tests run: 18, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.072 s -- in com.example.onlinejava.problem.ProblemDefinitionContractTest
[INFO] Tests run: 43, Failures: 0, Errors: 0, Skipped: 0
[INFO] BUILD SUCCESS

The repo's own CI (.github/workflows/ci-cd.yml) will independently re-run the full suite against a real Postgres container before merge is possible.

Opened automatically by a scheduled cloud agent (every 2 hours), not auto-merged -- please review.

🤖 Generated with Claude Code

https://claude.ai/code/session_01GTNCBT8dJKatDtYhD26XwJ

---

Generated by Claude Code

[coderabbitai]

Important

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This repository does not receive automatic reviews because it has fewer than 10 stars.

Run configuration

• Source mode: Auto
• Repository: RuslanLomaka/OnlineJavaSandbox
• Branch: problem/kth-largest-element
• File: .coderabbit.yaml
• Commit: e03abf0
• Layers: Repository YAML
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: 2753f6c6-0fbc-42e9-a525-cc5c60e2d018

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[coderabbitai]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud