746. Min Cost Climbing Stairs

[yamcodes]

Summary by CodeRabbit

• New Features

  • Added solution implementations for the Min Cost Climbing Stairs algorithm problem.

• Documentation

  • Restructured Solutions table in README with improved formatting, expanded metadata presentation, and internal source code links.
  • Added package-level documentation for new problem solutions.

• Tests

  • Added comprehensive unit test coverage including parameterized test cases for Min Cost Climbing Stairs solutions.

[coderabbitai]

Walkthrough

This changeset introduces a complete solution package for the LeetCode "Min Cost Climbing Stairs" problem. Two algorithmic approaches are added: a standard dynamic programming solution (O(n) time/space) and a space-optimized variant (O(n) time/O(1) space). Complete test coverage with parameterized tests and documentation are included. The README is updated with internal source path references.

Changes

Cohort / File(s)	Summary
Documentation & Metadata README.md, src/main/java/codes/yam/leetcode/mincostclimbingstairs/package-info.java	Updated Solutions table with internal source file links and problem metadata; added package documentation with problem description, solution progression, and complexity annotations.
Production Solutions src/main/java/codes/yam/leetcode/mincostclimbingstairs/Solution.java, src/main/java/codes/yam/leetcode/mincostclimbingstairs/SolutionDp.java	Two implementations of minCostClimbingStairs: SolutionDp uses standard DP with explicit dp array (O(n) space), Solution optimizes space using two rolling variables (O(1) space). Both achieve O(n) time complexity.
Test Suite src/test/java/codes/yam/leetcode/mincostclimbingstairs/SolutionTest.java, src/test/java/codes/yam/leetcode/mincostclimbingstairs/SolutionDpTest.java, src/test/java/codes/yam/leetcode/mincostclimbingstairs/TestCases.java	JUnit 5 parameterized test classes for both solutions, sharing centralized test case definitions with two test scenarios validating correctness of the minimum cost calculation.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 A staircase climbed with minimal cost,
Two paths unfold—one swift, one cross'd,
With tests in hand and docs so bright,
The stairs ascend to LeetCode height! 🚀

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly references the LeetCode problem number (746) and problem name (Min Cost Climbing Stairs), which accurately describes the main change—adding a complete solution implementation with multiple approaches and test coverage for this specific problem.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch min-cost-climbing-stairs

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No actionable comments were generated in the recent review. 🎉

🧹 Recent nitpick comments

src/test/java/codes/yam/leetcode/mincostclimbingstairs/TestCases.java (1)

8-12: Consider adding edge-case test inputs.

The two cases cover the LeetCode examples, but a minimal-length input (e.g., {0, 0} → 0 or {10, 15} → 10) would exercise the boundary where the loop body never executes. A single-step-dominance case (e.g., {1, 2} → 1) is also cheap to add.

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