feat(algorithms): two pointers #145
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BrianLusina
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Caution Review failedThe pull request is closed. 📝 WalkthroughWalkthroughReorganizes DIRECTORY moving multiple problems into a Two Pointers category, adds Triangle Numbers and Trapping Rain Water implementations/tests, relocates Move Zeroes and Two Sum artifacts into algorithms/two_pointers, refactors three_sum and move_zeroes implementations/tests, updates READMEs and image paths, and removes duplicate puzzle-level docs/tests. Changes
Sequence Diagram(s)(omitted — changes are algorithmic additions/refactors without multi-component interaction flows warranting a sequence diagram) Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes Possibly related PRs
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Actionable comments posted: 1
🤖 Fix all issues with AI agents
In @algorithms/two_pointers/three_sum/__init__.py:
- Line 7: Fix the typo in the module docstring in three_sum's __init__.py:
change the word "Ww" to "We" so the sentence reads correctly (e.g., "We assume
that n is the length of the input array"); update the docstring text in
__init__.py accordingly.
🧹 Nitpick comments (4)
algorithms/two_pointers/three_sum/test_three_sum.py (1)
6-15: Remove duplicate test cases.Lines 7 and 11 contain identical test cases, as do lines 10 and 14. These duplicates don't add value and should be removed.
♻️ Proposed refactor
THREE_SUM_TEST_CASES = [ ([-1, 0, 1, 2, -1, -4], [[-1, -1, 2], [-1, 0, 1]]), ([0, 1, 1], []), ([0, 0, 0], [[0, 0, 0]]), ([-1, 0, 1, 2, -1, -1], [[-1, -1, 2], [-1, 0, 1]]), - ([-1, 0, 1, 2, -1, -4], [[-1, -1, 2], [-1, 0, 1]]), ([-1, 0, 1, 2, -1, -4, 2], [[-1, -1, 2], [-1, 0, 1], [-4, 2, 2]]), ([-1, -1, 0, 1, 1, 1, 2], [[-1, -1, 2], [-1, 0, 1]]), - ([-1, 0, 1, 2, -1, -4, -1, 2, 1], [[-1, -1, 2], [-1, 0, 1], [-4, 2, 2]]), ]DIRECTORY.md (1)
227-228: Consider adjusting indentation for consistency.The indentation here (4 and 6 spaces) doesn't match the pattern used elsewhere in this file (2 and 4 spaces for nested lists). Consider adjusting for consistency.
♻️ Proposed fix
* Three Sum * [Test Three Sum](https://github.com/BrianLusina/PythonSnips/blob/master/algorithms/two_pointers/three_sum/test_three_sum.py) - * Triangle Numbers - * [Test Triangle Numbers](https://github.com/BrianLusina/PythonSnips/blob/master/algorithms/two_pointers/triangle_numbers/test_triangle_numbers.py) + * Triangle Numbers + * [Test Triangle Numbers](https://github.com/BrianLusina/PythonSnips/blob/master/algorithms/two_pointers/triangle_numbers/test_triangle_numbers.py)algorithms/two_pointers/triangle_numbers/test_triangle_numbers.py (1)
6-10: Consider adding test case for empty input.The
triangle_numberimplementation handles empty input with an early return, but there's no test case to verify this behavior.🧪 Proposed addition
TRIANGLE_NUMBER_TEST_CASES = [ + ([], 0), ([11, 4, 9, 6, 15, 18], 10), ([2,2,3,4], 3), ([4,2,3,4], 4), ]algorithms/two_pointers/triangle_numbers/__init__.py (1)
26-48: Algorithm implementation is correct.The two-pointer approach correctly identifies valid triangles using the triangle inequality. The counting logic
count += right - leftis elegant and correct for a sorted array.The comments on lines 44 and 47 could be clarified for better readability:
📝 Suggested comment improvements
- # we decrement right to check if there are valid triplets that can be formed by decreasing the middle valid + # Decrement right to check for more valid triplets with a smaller second side right -= 1 else: - # Increase the left to find the next maximum minimum number that can form a valid triplet + # Increment left to find a larger first side that can form a valid triplet left += 1
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DIRECTORY.mdalgorithms/intervals/insert_interval/README.mdalgorithms/two_pointers/three_sum/README.mdalgorithms/two_pointers/three_sum/__init__.pyalgorithms/two_pointers/three_sum/test_three_sum.pyalgorithms/two_pointers/triangle_numbers/README.mdalgorithms/two_pointers/triangle_numbers/__init__.pyalgorithms/two_pointers/triangle_numbers/test_triangle_numbers.py
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🧬 Code graph analysis (1)
algorithms/two_pointers/triangle_numbers/test_triangle_numbers.py (1)
algorithms/two_pointers/triangle_numbers/__init__.py (1)
triangle_number(4-51)
🪛 LanguageTool
algorithms/two_pointers/triangle_numbers/README.md
[style] ~64-~64: Using many exclamation marks might seem excessive (in this case: 20 exclamation marks for a text that’s 3306 characters long)
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algorithms/two_pointers/three_sum/README.md
[style] ~82-~82: Using many exclamation marks might seem excessive (in this case: 9 exclamation marks for a text that’s 2415 characters long)
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DIRECTORY.md
227-227: Unordered list indentation
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228-228: Unordered list indentation
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🔇 Additional comments (8)
algorithms/intervals/insert_interval/README.md (1)
28-28: Documentation formatting looks good.The addition of backticks around variable names and code references (
merged,newInterval,intervals) improves readability and aligns with markdown documentation conventions. The phase descriptions are clear and accurately describe the algorithm's logic.Also applies to: 31-48
algorithms/two_pointers/three_sum/__init__.py (1)
42-49: LGTM! Effective duplicate handling.The duplicate skipping logic correctly prevents duplicate triplets by advancing both pointers past equal values after finding a valid triplet. This ensures all unique triplets are captured exactly once.
algorithms/two_pointers/triangle_numbers/__init__.py (5)
4-14: LGTM! Well-documented function signature.The function signature with type hints and the comprehensive docstring clearly explain the purpose and behavior. The warning about in-place manipulation is particularly valuable for callers.
16-17: LGTM! Proper edge case handling.The early return for empty or falsy input is correct and prevents unnecessary computation.
19-21: LGTM! Sorting is correctly applied.The in-place sort prepares the array for the two-pointer technique, and the complexity analysis is accurate.
50-51: LGTM! Clean return statement.The final return is straightforward and properly documented.
4-51: In-place modification is properly documented and handled.The function's docstring clearly states that input is manipulated in-place, and the only visible caller (the test suite) correctly handles this by not relying on the original list state after the function returns. No changes needed.
algorithms/two_pointers/three_sum/README.md (1)
36-92: LGTM! Clear and comprehensive documentation.The Solution section provides an excellent walkthrough of the two-pointer approach for the Three Sum problem. The explanation logically progresses from the basic algorithm to handling duplicates and termination conditions. All 19 referenced solution images are present in the
./images/solutions/directory.
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⚠️ Outside diff range comments (1)
algorithms/two_pointers/move_zeroes/__init__.py (1)
4-27: Update docstring to match refactored implementation.The function's docstring (lines 7-10) describes a "left & right pointers" approach, but the current implementation uses a single
next_non_zeropointer with an index-based loop. While the algorithm is correct and efficient, the documentation should accurately describe the implementation.📝 Suggested docstring update
def move_zeroes(nums: List[int]) -> None: """ Modifies the list in place by moving the non-zero elements to the front maintaining their order and the zero elements - to the back. This uses 2 pointers with the left & right pointers being initialized at 0 and checking the value of - each pointer at each iteration. It performs a swap of the values if the left and right pointers are at elements - that are 0 and non-zero respectively, This way, non-zero elements retain their order, while 0 elements are moved to - the back. + to the back. This uses a single pointer (next_non_zero) to track the position where the next non-zero element should + be placed. As we iterate through the list, when a non-zero element is found, it's swapped with the position at + next_non_zero (if different), then next_non_zero is incremented. This way, non-zero elements retain their order + while zero elements are moved to the back. Complexity:
🤖 Fix all issues with AI agents
In @algorithms/two_pointers/move_zeroes/README.md:
- Line 42: The README contains a duplicate image reference: the img tag at the
second occurrence uses move_zeroes_solution_1.png but should point to the
distinct file move_zeroes_solution_11.png; update the image reference in
algorithms/two_pointers/move_zeroes/README.md to use move_zeroes_solution_11.png
so the displayed image matches the intended Solution 11.
In @algorithms/two_pointers/move_zeroes/test_move_zeroes.py:
- Line 20: The test function signature for test_move_zeroes has an invalid type
hint for the expected parameter; update the signature in test_move_zeroes to use
a proper typing annotation (expected: List[int]) to match nums and follow Python
typing conventions, ensuring any necessary imports (List) are present at the top
of the test file.
🧹 Nitpick comments (1)
algorithms/two_pointers/move_zeroes/README.md (1)
32-42: Consider consistent image path format.These image paths use
./images/...format, while the Two Sum README was updated to useimages/...(without the leading./). For consistency across the two_pointers documentation, consider using the same format.♻️ Optional consistency improvement
- - + +(Apply similar changes to all image references in lines 32-44)
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DIRECTORY.mdalgorithms/two_pointers/array_3_pointers/README.mdalgorithms/two_pointers/array_3_pointers/__init__.pyalgorithms/two_pointers/array_3_pointers/test_array_3_pointers.pyalgorithms/two_pointers/move_zeroes/README.mdalgorithms/two_pointers/move_zeroes/__init__.pyalgorithms/two_pointers/move_zeroes/test_move_zeroes.pyalgorithms/two_pointers/three_sum/__init__.pyalgorithms/two_pointers/triangle_numbers/test_triangle_numbers.pyalgorithms/two_pointers/two_sum/README.mdalgorithms/two_pointers/two_sum/__init__.pyalgorithms/two_pointers/two_sum/test_two_sum.pyalgorithms/two_pointers/two_sum_less_k/README.mdalgorithms/two_pointers/two_sum_less_k/__init__.pyalgorithms/two_pointers/two_sum_less_k/test_two_sum.pypuzzles/arrays/move_zeroes/README.mdpuzzles/arrays/move_zeroes/test_move_zeroes.py
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- puzzles/arrays/move_zeroes/README.md
- puzzles/arrays/move_zeroes/test_move_zeroes.py
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- algorithms/two_pointers/two_sum_less_k/README.md
🚧 Files skipped from review as they are similar to previous changes (2)
- algorithms/two_pointers/triangle_numbers/test_triangle_numbers.py
- algorithms/two_pointers/three_sum/init.py
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algorithms/two_pointers/move_zeroes/test_move_zeroes.py (1)
algorithms/two_pointers/move_zeroes/__init__.py (2)
move_zeroes(4-27)move_zeroes_one(30-65)
algorithms/two_pointers/two_sum/test_two_sum.py (1)
algorithms/two_pointers/two_sum/__init__.py (1)
two_sum(6-32)
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algorithms/two_pointers/two_sum/README.md
[style] ~81-~81: Using many exclamation marks might seem excessive (in this case: 13 exclamation marks for a text that’s 3525 characters long)
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algorithms/two_pointers/move_zeroes/README.md
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🔇 Additional comments (7)
algorithms/two_pointers/two_sum/README.md (1)
54-94: LGTM! Image path consistency improvement.The removal of the leading
./from image paths improves consistency across the documentation. The paths remain valid and functional.DIRECTORY.md (1)
209-232: Added Two Pointers algorithm entries successfully.The new entries for Array 3 Pointers, Move Zeroes, Triangle Numbers, Two Sum, and Two Sum Less K are correctly formatted and linked. The indentation style matches the existing format used throughout this file.
Note: The markdownlint warnings about indentation (MD007) apply to the existing file style, not just these changes. If you wish to address these warnings, consider a separate formatting PR to update the entire file consistently.
algorithms/two_pointers/move_zeroes/__init__.py (1)
22-27: LGTM! Efficient refactoring with self-swap optimization.The refactored implementation correctly moves zeros to the end while maintaining the relative order of non-zero elements. The conditional check
if idx != next_non_zero:is a good optimization that prevents unnecessary self-swaps when no zeros have been encountered yet.algorithms/two_pointers/two_sum/test_two_sum.py (1)
5-9: Import path update verified successfully.The import path change from
algorithms.arrays.two_sumtoalgorithms.two_pointers.two_sumis complete across the codebase. No remaining references to the old path exist, and the new module location is properly established.algorithms/two_pointers/move_zeroes/test_move_zeroes.py (3)
1-4: LGTM! Imports are clean and appropriate.The imports are well-organized and include all necessary dependencies for parameterized testing and type hints.
6-15: Good test coverage with diverse scenarios.The test cases comprehensively cover various edge cases including single elements, all zeros, no zeros, and mixed positions. This ensures both implementations handle the full range of inputs correctly.
30-31: LGTM! Standard unittest runner.The main block follows the standard unittest convention for running tests directly.
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