feat(algorithms, prefix-sum, intervals) employee free time #133
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📝 WalkthroughWalkthroughAdds Continuous Subarray Sum (prefix-sum), Employee Free Time (intervals) including an Interval class and heap-based variant, Sub Array With Sum under data structures, numeric palindrome checks, READMEs, and corresponding parameterized unit tests; updates Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes Poem
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Actionable comments posted: 1
🧹 Nitpick comments (2)
pystrings/palindrome/README.md (1)
182-182: Optional: Rephrase to improve readability.Three successive sentences begin with "If", which slightly impacts flow. Consider rephrasing the third sentence.
🔎 Suggested rewording
- - If the length of the reversedHalf is odd, then compare x == reversedHalf // 10 to ignoring the middle digit. If - it's a valid match, return TRUE. + - If the length of the reversedHalf is odd, then compare x == reversedHalf // 10 to ignore the middle digit. When + this condition holds, return TRUE.pystrings/palindrome/__init__.py (1)
113-141: Simplify the return statement.The if-else block at lines 138-141 can be condensed into a single return statement for better readability.
🔎 Proposed simplification
- # If the number has even digits, check x == reversedHalf. - # If odd digits, the middle digit doesn't matter, so remove it using //10. - # If either of the above are True, return True. Otherwise, False - if x == reversed_half or x == reversed_half // 10: - return True - else: - return False + # If the number has even digits, check x == reversedHalf. + # If odd digits, the middle digit doesn't matter, so remove it using //10. + return x == reversed_half or x == reversed_half // 10
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algorithms/prefix_sum/continous_sub_array_sum/images/examples/continuous_sub_array_sum_example_1.pngis excluded by!**/*.png
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DIRECTORY.mdalgorithms/prefix_sum/__init__.pyalgorithms/prefix_sum/continous_sub_array_sum/README.mdalgorithms/prefix_sum/continous_sub_array_sum/__init__.pyalgorithms/prefix_sum/continous_sub_array_sum/test_check_subarray_sum.pydatastructures/arrays/sub_array_with_sum/test_sub_array_with_sum.pypystrings/palindrome/README.mdpystrings/palindrome/__init__.pypystrings/palindrome/test_palindrome.py
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🧬 Code graph analysis (2)
algorithms/prefix_sum/continous_sub_array_sum/test_check_subarray_sum.py (1)
algorithms/prefix_sum/continous_sub_array_sum/__init__.py (1)
check_subarray_sum(4-27)
pystrings/palindrome/test_palindrome.py (1)
pystrings/palindrome/__init__.py (5)
is_palindrome(1-52)smallest_palindrome(72-80)largest_palindrome(101-110)is_palindrome_number(113-141)is_palindrome_number_2(144-164)
🪛 LanguageTool
algorithms/prefix_sum/continous_sub_array_sum/README.md
[style] ~59-~59: This phrasing could be wordy, so try replacing it with something more concise.
Context: ...nd the stored index of the remainder is greater than 1. 7. Return True immediately if both c...
(MORE_THAN_EXCEEDS)
[grammar] ~67-~67: Use a hyphen to join words.
Context: ...the array nums once, performing constant time operations for each element. ### S...
(QB_NEW_EN_HYPHEN)
pystrings/palindrome/README.md
[style] ~182-~182: Three successive sentences begin with the same word. Consider rewording the sentence or use a thesaurus to find a synonym.
Context: ...alf // 10 to ignoring the middle digit. If it’s a valid match, return TRUE. 5...
(ENGLISH_WORD_REPEAT_BEGINNING_RULE)
🪛 markdownlint-cli2 (0.18.1)
DIRECTORY.md
132-132: Unordered list indentation
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🔇 Additional comments (8)
algorithms/prefix_sum/continous_sub_array_sum/test_check_subarray_sum.py (1)
1-24: LGTM! Well-structured test file.The test file follows best practices with parameterized test cases covering various scenarios. The test structure is clean and appropriate for validating the
check_subarray_sumfunction.algorithms/prefix_sum/continous_sub_array_sum/README.md (1)
1-73: Documentation is clear and comprehensive.The README provides excellent explanation of the problem, algorithm approach, and complexity analysis. The minor style suggestions from static analysis (hyphenation, wordiness) are purely optional improvements.
DIRECTORY.md (1)
132-134: Directory structure updated correctly.The new entries for Prefix Sum algorithms are properly integrated into the directory listing. The markdown indentation hints from static analysis are minor formatting suggestions that don't impact functionality.
Also applies to: 256-257
algorithms/prefix_sum/continous_sub_array_sum/__init__.py (1)
18-26: Remainder checking logic is correct.The logic for checking previously seen remainders and validating subarray length (≥ 2) is sound. This section will work correctly once the cumulative sum update issue is resolved.
pystrings/palindrome/README.md (1)
130-198: Well-documented algorithm with clear explanation.The documentation thoroughly explains the palindrome number problem, including edge cases, algorithm steps, and complexity analysis. The explanation of the half-reversal optimization is particularly clear.
pystrings/palindrome/__init__.py (1)
144-164: LGTM! String-based approach is correct.The two-pointer string comparison provides a clean alternative implementation. The edge case handling matches the mathematical approach, ensuring consistent behavior across both functions.
pystrings/palindrome/test_palindrome.py (2)
91-113: Excellent test coverage with parameterized approach.The test cases comprehensively cover edge cases including negative numbers, trailing zeros, zero itself, and large palindromes. Using
@parameterized.expandto test both implementations with identical cases ensures consistency.
6-6: Review the known limitation with pytest parameterized testing.Version 0.9.0 is the latest stable release and correctly specified. However, note that pytest may display generic test indices (e.g.,
test_name[0]) instead of full parameter values when using parameterized, and there are several open GitHub issues related to edge cases (bytes as parameters, etc.). Verify that test output clarity is acceptable for this project.
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Actionable comments posted: 5
🧹 Nitpick comments (2)
algorithms/intervals/employee_free_time/interval.py (1)
1-19: Consider adding__hash__method for hashability.Defining
__eq__without__hash__makes Interval objects unhashable, preventing their use in sets or as dictionary keys. While the current usage only involves lists, adding__hash__is a Python best practice when__eq__is defined.🔎 Proposed implementation
def __eq__(self, other: "Interval") -> bool: return self.start == other.start and self.end == other.end + + def __hash__(self) -> int: + return hash((self.start, self.end))Note: If you decide to include
closedin__eq__, also include it in__hash__.algorithms/intervals/employee_free_time/test_employee_free_time.py (1)
10-85: Consider adding edge case tests.The current test cases cover typical scenarios well. Consider adding tests for edge cases such as:
- Empty schedules list
- Single employee with one or multiple intervals
- Employees with no overlapping time (maximum free time)
- Employees with completely overlapping schedules (no free time)
- Schedules with adjacent but non-overlapping intervals
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⛔ Files ignored due to path filters (10)
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📒 Files selected for processing (6)
DIRECTORY.mdalgorithms/intervals/employee_free_time/README.mdalgorithms/intervals/employee_free_time/__init__.pyalgorithms/intervals/employee_free_time/interval.pyalgorithms/intervals/employee_free_time/test_employee_free_time.pyalgorithms/prefix_sum/continous_sub_array_sum/__init__.py
🚧 Files skipped from review as they are similar to previous changes (1)
- algorithms/prefix_sum/continous_sub_array_sum/init.py
🧰 Additional context used
🧬 Code graph analysis (2)
algorithms/intervals/employee_free_time/test_employee_free_time.py (2)
algorithms/intervals/employee_free_time/__init__.py (2)
employee_free_time(6-56)employee_free_time_heap(59-114)algorithms/intervals/employee_free_time/interval.py (1)
Interval(1-19)
algorithms/intervals/employee_free_time/__init__.py (1)
algorithms/intervals/employee_free_time/interval.py (1)
Interval(1-19)
🪛 LanguageTool
algorithms/intervals/employee_free_time/README.md
[style] ~1-~1: The word “free” tends to be overused. Consider using an alternative wording to strengthen your writing.
Context: # Employee Free Time You’re given a list containing the sch...
(FREE_TIME)
[style] ~5-~5: The word “free” tends to be overused. Consider using an alternative wording to strengthen your writing.
Context: ...st of finite intervals representing the free time for all the employees. > Note: The com...
(FREE_TIME)
[style] ~29-~29: The word “free” tends to be overused. Consider using an alternative wording to strengthen your writing.
Context: ...tinue identifying additional periods of free time. We use the following variables in our...
(FREE_TIME)
[style] ~40-~40: ‘in a heap’ might be wordy. Consider a shorter alternative.
Context: ...tart time of the first interval present in a heap. - Then, we iterate a loop until the he...
(EN_WORDINESS_PREMIUM_IN_A_HEAP)
🪛 markdownlint-cli2 (0.18.1)
DIRECTORY.md
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🔇 Additional comments (3)
algorithms/intervals/employee_free_time/interval.py (1)
18-19: Verify that ignoringclosedin equality is intentional.The
__eq__method compares onlystartandendattributes, ignoring theclosedattribute. This meansInterval(1, 2)withclosed=TrueequalsInterval(1, 2)withclosed=False. If this is intentional (e.g., for domain-specific reasons), consider documenting this behavior. Otherwise, includeclosedin the comparison.algorithms/intervals/employee_free_time/__init__.py (2)
39-56: Core algorithm logic is correct.The gap detection and merging logic correctly identifies free time intervals by tracking
latest_endand comparing it with each interval's start time.
85-114: Heap processing logic is correct.The heap-based approach correctly maintains the earliest unprocessed interval at the top and properly tracks
latest_end_timeto identify gaps. The logic for pushing subsequent intervals from the same employee is also correct.
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Describe your change:
Adds a couple of algorithms:
Checklist:
Fixes: #{$ISSUE_NO}.Summary by CodeRabbit
New Features
Documentation
Tests
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