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Merged
merged 7 commits into from
Mar 19, 2025
Merged

Update prefix_sum.py #12560

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cae97f0
Update prefix_sum.py
pranjaykumar926 Feb 4, 2025
c8a345e
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Feb 4, 2025
b0d0021
Update prefix_sum.py
MaximSmolskiy Mar 19, 2025
6c680b1
Update prefix_sum.py
MaximSmolskiy Mar 19, 2025
6bee841
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Mar 19, 2025
de5705c
Update prefix_sum.py
MaximSmolskiy Mar 19, 2025
c697a4c
Update prefix_sum.py
MaximSmolskiy Mar 19, 2025
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20 changes: 19 additions & 1 deletion data_structures/arrays/prefix_sum.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,11 +30,29 @@ def get_sum(self, start: int, end: int) -> int:
5
>>> PrefixSum([1,2,3]).get_sum(2, 2)
3
>>> PrefixSum([]).get_sum(0, 0)
Traceback (most recent call last):
...
ValueError: The array is empty.
>>> PrefixSum([1,2,3]).get_sum(-1, 2)
Traceback (most recent call last):
...
ValueError: Invalid range specified.
>>> PrefixSum([1,2,3]).get_sum(2, 3)
Traceback (most recent call last):
...
IndexError: list index out of range
ValueError: Invalid range specified.
>>> PrefixSum([1,2,3]).get_sum(2, 1)
Traceback (most recent call last):
...
ValueError: Invalid range specified.
"""
if not self.prefix_sum:
raise ValueError("The array is empty.")

if start < 0 or end >= len(self.prefix_sum) or start > end:
raise ValueError("Invalid range specified.")

if start == 0:
return self.prefix_sum[end]

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