feat(algorithms, intervals, data-stream): data stream disjoint intervals #137
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BrianLusina
added
enhancement
Algorithm
📝 WalkthroughWalkthroughA new Data Stream feature was introduced to manage disjoint intervals, including two implementation classes (SummaryRanges and SummaryRangesV2), comprehensive documentation, and test coverage. The feature supports adding numbers to a stream and retrieving merged interval ranges with automatic merging logic for connected or overlapping intervals. Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes Suggested labels
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✅ Passed checks (2 passed)
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🧹 Nitpick comments (3)
algorithms/intervals/data_stream/README.md (1)
114-114: Minor: Consider hyphenating compound adjective.The phrase "Worst case" should be hyphenated when used as a compound adjective: "Worst-case relation to n".
Suggested fix
-- Worst case relation to n: If there are n Add Num(int value) calls and nothing ever merges, then k=O(n), giving +- Worst-case relation to n: If there are n Add Num(int value) calls and nothing ever merges, then k=O(n), givingalgorithms/intervals/data_stream/__init__.py (2)
50-56: Optional: Simplify duplicated assignment.Both branches of the conditional assign
self.intervals[new_start] = new_end. While the current form clearly documents the intent (update vs insert), you could simplify it:Proposed refactoring
- # Insert the merged or new interval into the map - if new_start in self.intervals: - # update existing interval(merged with previous) - self.intervals[new_start] = new_end - else: - # insert new - self.intervals[new_start] = new_end - insort(self.starts, new_start) + # Insert the merged or new interval into the map + self.intervals[new_start] = new_end + if new_start not in self.starts: + insort(self.starts, new_start)
119-126: Consider returning a copy to protect internal state.The method returns
self.intervalsdirectly, which exposes the internal mutable list to external modification. While the current tests don't exploit this, it's a design issue that could lead to bugs if callers modify the returned list.Note that
SummaryRanges.get_intervals()(lines 58-68) correctly returns a new list, which is safer.Proposed fix
def get_intervals(self) -> List[List[int]]: """ Returns the current summary of numbers as a list of disjoint intervals [start_i, end_i], sorted by start_i. This is run in O(1) time as it simply returns the list of intervals. Returns: List[List[int]]: List of disjoint intervals """ - return self.intervals + return [interval[:] for interval in self.intervals] # Return a deep copyNote: This changes the time complexity from O(1) to O(k), but ensures encapsulation. Alternatively, document that callers should not modify the returned list.
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📒 Files selected for processing (4)
DIRECTORY.mdalgorithms/intervals/data_stream/README.mdalgorithms/intervals/data_stream/__init__.pyalgorithms/intervals/data_stream/test_data_stream_as_disjoint_intervals.py
🧰 Additional context used
🧬 Code graph analysis (1)
algorithms/intervals/data_stream/test_data_stream_as_disjoint_intervals.py (1)
algorithms/intervals/data_stream/__init__.py (6)
SummaryRanges(5-68)SummaryRangesV2(71-126)add_num(13-56)add_num(78-117)get_intervals(58-68)get_intervals(119-126)
🪛 LanguageTool
algorithms/intervals/data_stream/README.md
[style] ~42-~42: Consider using “the surrounding ranges”.
Context: ...gle-point interval, and then we look at the ranges around it to decide how it fits. - If an existin...
(NOUN_AROUND_IT)
[style] ~46-~46: Three successive sentences begin with the same word. Consider rewording the sentence or use a thesaurus to find a synonym.
Context: ..., we extend that range to include it. - If the value lies just before the start of...
(ENGLISH_WORD_REPEAT_BEGINNING_RULE)
[style] ~47-~47: Three successive sentences begin with the same word. Consider rewording the sentence or use a thesaurus to find a synonym.
Context: ...a range, we merge it with that range. - If the value sits exactly between two rang...
(ENGLISH_WORD_REPEAT_BEGINNING_RULE)
[grammar] ~114-~114: Use a hyphen to join words.
Context: ...erval once to build the output. - Worst case relation to n: If there are n Add N...
(QB_NEW_EN_HYPHEN)
🪛 markdownlint-cli2 (0.18.1)
DIRECTORY.md
136-136: Unordered list indentation
Expected: 2; Actual: 4
(MD007, ul-indent)
137-137: Unordered list indentation
Expected: 4; Actual: 6
(MD007, ul-indent)
🔇 Additional comments (2)
DIRECTORY.md (1)
136-137: LGTM! Documentation update follows existing pattern.The new Data Stream documentation entries are correctly added and follow the existing indentation pattern in the file. The markdownlint indentation warnings can be safely ignored as they are false positives.
algorithms/intervals/data_stream/test_data_stream_as_disjoint_intervals.py (1)
1-39: LGTM! Comprehensive test coverage.The test cases effectively validate both implementations across multiple scenarios:
- Single element and duplicates
- Consecutive number merging
- Non-contiguous intervals
- Out-of-order insertions
The parameterized approach ensures both
SummaryRangesandSummaryRangesV2are tested identically, which is excellent for maintaining consistency.
Describe your change:
Data stream disjoint intervals
Checklist:
Fixes: #{$ISSUE_NO}.Summary by CodeRabbit
New Features
Documentation
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