feat(algorithms stacks): reverse string character array#186
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BrianLusina merged 3 commits intomainfrom Mar 9, 2026
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feat(algorithms stacks): reverse string character array#186BrianLusina merged 3 commits intomainfrom
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📝 WalkthroughWalkthroughThis pull request moves seven Stack entries from Puzzles > Queue to Algorithms > Stack in Changes
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Actionable comments posted: 3
🧹 Nitpick comments (1)
algorithms/stack/reverse_string/test_reverse_string.py (1)
7-12: Consider adding empty list test case for complete edge case coverage.The implementation handles empty lists (
if not s), but there's no test case verifying this behaviour. Adding a test for the empty list edge case would improve coverage.💡 Suggested addition
REVERSE_STRING_CHAR_ARRAY_TEST_CASES = [ (["a", "e", "i", "o", "u"], ["u", "o", "i", "e", "a"]), (["A", "l", "e", "x"], ["x", "e", "l", "A"]), (["p", "y", "t", "h", "o", "n"], ["n", "o", "h", "t", "y", "p"]), (["x"], ["x"]), + ([], []), ]🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@algorithms/stack/reverse_string/test_reverse_string.py` around lines 7 - 12, Add an empty-list test case to REVERSE_STRING_CHAR_ARRAY_TEST_CASES to cover the edge case where the input is [] and should remain [], e.g. append the tuple ([], []) to the list so the test suite verifies the implementation's early-return branch (the code path using "if not s"); update the test data in algorithms/stack/reverse_string/test_reverse_string.py by adding this tuple to the existing REVERSE_STRING_CHAR_ARRAY_TEST_CASES.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@algorithms/stack/reverse_string/__init__.py`:
- Around line 36-48: Add a return type hint and a docstring to
reverse_string_char_array: change its signature to include "-> None" and add a
docstring immediately below the def that describes purpose, parameters, in-place
behavior, time O(n) and space O(1) complexity, and include a URL reference to an
explanatory resource (matching the style of reverse_string). Keep wording
consistent with the existing reverse_string docstring and mention that the
function mutates the input list in place.
In `@algorithms/stack/reverse_string/README.md`:
- Around line 45-46: Fix the missing space in the README sentence by changing
"size.Thus" to "size. Thus" in the space complexity paragraph (look for the
sentence containing "The solution’s space complexity is O(1), as the reversal is
done in place using only two pointers (left and right). No additional data
structures are required, regardless of the input size.Thus, the overall space
complexity remains O(1)."). Ensure there is a single space after the period
before "Thus".
- Around line 39-41: The time complexity paragraph contains a typographical
error: replace the stray "nnn" with "n" in the time complexity section
describing the input array s so the sentence reads "where n is the length of the
input array, s."; update the sentence that currently starts with "The solution’s
time complexity is O(n), where nnn is the length of the input array, s." to use
the single-letter n.
---
Nitpick comments:
In `@algorithms/stack/reverse_string/test_reverse_string.py`:
- Around line 7-12: Add an empty-list test case to
REVERSE_STRING_CHAR_ARRAY_TEST_CASES to cover the edge case where the input is
[] and should remain [], e.g. append the tuple ([], []) to the list so the test
suite verifies the implementation's early-return branch (the code path using "if
not s"); update the test data in
algorithms/stack/reverse_string/test_reverse_string.py by adding this tuple to
the existing REVERSE_STRING_CHAR_ARRAY_TEST_CASES.
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Configuration used: Organization UI
Review profile: CHILL
Plan: Pro
Run ID: 1df2df47-3a81-4b4e-b774-d46e41521751
⛔ Files ignored due to path filters (3)
algorithms/stack/reverse_string/images/examples/reverse_string_example_1.pngis excluded by!**/*.pngalgorithms/stack/reverse_string/images/examples/reverse_string_example_2.pngis excluded by!**/*.pngalgorithms/stack/reverse_string/images/examples/reverse_string_example_3.pngis excluded by!**/*.png
📒 Files selected for processing (25)
DIRECTORY.mdalgorithms/stack/asteroid_collision/README.mdalgorithms/stack/asteroid_collision/__init__.pyalgorithms/stack/asteroid_collision/test_asteroid_collision.pyalgorithms/stack/bracket_validator/README.mdalgorithms/stack/bracket_validator/__init__.pyalgorithms/stack/bracket_validator/test_bracket_validator.pyalgorithms/stack/decimal_to_binary/README.mdalgorithms/stack/decimal_to_binary/__init__.pyalgorithms/stack/decimal_to_binary/test_decimal_to_binary.pyalgorithms/stack/decode_string/README.mdalgorithms/stack/decode_string/__init__.pyalgorithms/stack/decode_string/test_decode_string.pyalgorithms/stack/nextgreater/README.mdalgorithms/stack/nextgreater/__init__.pyalgorithms/stack/nextgreater/test_next_greater.pyalgorithms/stack/removing_stars/README.mdalgorithms/stack/removing_stars/__init__.pyalgorithms/stack/removing_stars/test_remove_starts.pyalgorithms/stack/reverse_string/README.mdalgorithms/stack/reverse_string/__init__.pyalgorithms/stack/reverse_string/test_reverse_string.pypuzzles/stack/__init__.pypuzzles/stack/reverse_string/README.mdpuzzles/stack/reverse_string/test_reverse_string.py
💤 Files with no reviewable changes (2)
- puzzles/stack/reverse_string/test_reverse_string.py
- puzzles/stack/reverse_string/README.md
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Describe your change:
Reverse string character array in place
Checklist:
Fixes: #{$ISSUE_NO}.Summary by CodeRabbit
Documentation
New Features
Tests
Refactor