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* Update prefix_sum.py Index Validation for get_sum Raises ValueError if start or end is out of range or start > end. Handles cases where the array is empty. ✅ Empty Array Support If an empty array is passed, get_sum raises an appropriate error instead of failing unexpectedly. ✅ Optimized contains_sum Initialization Initializes sums with {0} for efficient subarray sum checking. * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Update prefix_sum.py * Update prefix_sum.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Update prefix_sum.py * Update prefix_sum.py --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Maxim Smolskiy <mithridatus@mail.ru>
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