LeedCode-268: Missing number Opt Solution

[WazedKhan]

Summary by CodeRabbit

• New Features

  • Added implementation for LeetCode problem 268: Missing Number with complete documentation describing the algorithm approach and expected input/output behavior.

• Tests

  • Added test cases covering multiple scenarios and edge cases including single-element lists, near-complete sequences, standard missing-number patterns, and boundary conditions for comprehensive validation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📝 Walkthrough

Walkthrough

A new LeetCode solution for problem 268 (missing number) is introduced with a mathematical algorithm that calculates the missing number by comparing expected and actual sums. Corresponding parameterized test cases are added covering multiple scenarios and edge cases.

Changes

Cohort / File(s)	Summary
New LeetCode Solution LeetCode/easy/missing_number_268.py	Implements Solution class with missingNumber method using mathematical approach (expected sum via formula n*(n+1)//2 minus actual sum) to identify missing number in array.
Test Cases tests/test_leetcode_easy.py	Adds parameterized test function test_missing_number with multiple test cases including edge scenarios (empty sequences, single elements, typical patterns). Note: test definition appears to be duplicated in the file.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 A missing number found at last,
With sums compared, the die is cast!
Math so neat, no loops to roam,
Tests confirm our algorithm's home.
Hop hop — another problem solved! 🥕

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Title check	❓ Inconclusive	The title references 'LeedCode-268: Missing number Opt Solution' but contains a typo ('LeedCode' instead of 'LeetCode') and uses vague abbreviation 'Opt' that doesn't clearly convey the main change or approach.	Clarify the title by fixing the typo and replacing 'Opt' with a specific descriptor like 'Mathematical Solution' or 'Sum-Based Solution' to better convey the implementation approach.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch missing-number-268

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[WazedKhan]

@WazedKhan these tests seems too much can u remove one