feat(algorithms, two-pointers): product of array except self#176
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BrianLusina
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📝 WalkthroughWalkthroughRelocates "Product Of Array Except Self" from Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes Poem
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Actionable comments posted: 3
🤖 Fix all issues with AI agents
In `@algorithms/two_pointers/product_of_array_except_self/__init__.py`:
- Line 23: The function product_except_self_two_pointers is missing type
annotations; update its signature to match the style used by
product_except_self_prefix_sums by annotating the parameter as a list of
integers and the return type as a list of integers (e.g., nums: List[int] ->
List[int]); also ensure you import List from typing at the top of the module if
it isn't already and keep implementation unchanged aside from the type hints.
- Around line 4-6: The early-return in product_except_self_prefix_sums currently
returns the input list for single-element arrays causing inconsistency with
product_except_self_two_pointers; update the guard in
product_except_self_prefix_sums so that for len(nums) <= 1 it returns [1] (the
product of zero elements) instead of nums, ensuring both implementations produce
[1] for single-element input.
In `@algorithms/two_pointers/product_of_array_except_self/README.md`:
- Line 103: Remove the stray empty bullet line in the README under the "Product
of Array Except Self" section: delete the lone "-" on line 103 so the markdown
has no empty list item; ensure surrounding list spacing stays correct and run a
quick markdown lint to confirm no leftover list artifacts in README.md.
🧹 Nitpick comments (3)
algorithms/two_pointers/product_of_array_except_self/__init__.py (1)
24-55: Excessive inline comments reduce readability.Nearly every line has a comment restating what the code does. These comments add noise rather than insight. Consider removing the obvious ones (e.g., "Move the left pointer to the right" for
l += 1) and keeping only those that explain why — the docstring or a brief header comment on the algorithm's strategy would be more valuable.algorithms/two_pointers/product_of_array_except_self/test_product_except_self.py (1)
9-17: Consider adding a two-element edge case.The test suite covers a good variety of inputs but lacks a minimal-length case like
([1, 2], [2, 1]). Since the problem guaranteesn >= 2, a two-element test would exercise the boundary.algorithms/two_pointers/product_of_array_except_self/README.md (1)
11-11: Minor: inconsistent code block language identifiers.Line 11 uses
```plainwhile Lines 17 and 23 use```text. Consider standardizing to one.
| def product_except_self_prefix_sums(nums: List[int]) -> List[int]: | ||
| if len(nums) <= 1: | ||
| return nums |
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Inconsistent single-element behavior between the two implementations.
product_except_self_prefix_sums returns nums as-is for single-element input (e.g., [5] → [5]), while product_except_self_two_pointers returns [1] for the same input. The mathematically correct answer (product of zero elements) is [1]. While LeetCode constrains n >= 2, this guard makes the two functions disagree.
Consider either removing this early return or changing it to return [1] for consistency:
Proposed fix
def product_except_self_prefix_sums(nums: List[int]) -> List[int]:
- if len(nums) <= 1:
- return nums
-
result = [1] * len(nums)
prefix = 1🤖 Prompt for AI Agents
In `@algorithms/two_pointers/product_of_array_except_self/__init__.py` around
lines 4 - 6, The early-return in product_except_self_prefix_sums currently
returns the input list for single-element arrays causing inconsistency with
product_except_self_two_pointers; update the guard in
product_except_self_prefix_sums so that for len(nums) <= 1 it returns [1] (the
product of zero elements) instead of nums, ensuring both implementations produce
[1] for single-element input.
algorithms/two_pointers/product_of_array_except_self/__init__.py
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| - Use two pointers—one starting from the beginning and the other from the end of the list. | ||
| - Multiply and update values in the output array based on accumulated products and current element values. | ||
| - Move the pointers toward each other to process the entire list. | ||
| - |
There was a problem hiding this comment.
Stray empty bullet point.
Line 103 has a lone - that appears to be a leftover. Remove it.
Proposed fix
- Move the pointers toward each other to process the entire list.
-- 📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| - | |
| - Move the pointers toward each other to process the entire list. |
🤖 Prompt for AI Agents
In `@algorithms/two_pointers/product_of_array_except_self/README.md` at line 103,
Remove the stray empty bullet line in the README under the "Product of Array
Except Self" section: delete the lone "-" on line 103 so the markdown has no
empty list item; ensure surrounding list spacing stays correct and run a quick
markdown lint to confirm no leftover list artifacts in README.md.
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
BrianLusina
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feat/algorithms-two-pointers-product-array-except-self
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Describe your change:
Product of Array except self
Checklist:
Fixes: #{$ISSUE_NO}.Summary by CodeRabbit
Documentation
New Features
Tests
Refactor
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