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Fixes #9943: Combination sum fix and test cases #10193

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Fixes #9943: Combination sum fix and test cases #10193

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4b99885
fixed_incorrect_test_combination_sum
architmaheshwari99 Oct 9, 2023
0975b24
reverting fn arg
architmaheshwari99 Oct 9, 2023
ba22496
ruff
architmaheshwari99 Oct 9, 2023
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11 changes: 10 additions & 1 deletion backtracking/combination_sum.py
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Original file line number Diff line number Diff line change
Expand Up @@ -47,10 +47,19 @@ def combination_sum(candidates: list, target: int) -> list:
>>> combination_sum([-8, 2.3, 0], 1)
Traceback (most recent call last):
...
RecursionError: maximum recursion depth exceeded
ValueError: All elements in candidates must be non-negative.
>>> combination_sum([], 1)
Traceback (most recent call last):
...
ValueError: Candidates list should not be empty
"""
path = [] # type: list[int]
answer = [] # type: list[int]
if not candidates:
raise ValueError("Candidates list should not be empty")

if any(x < 0 for x in candidates):
raise ValueError("All elements in candidates must be non-negative.")
backtrack(candidates, path, answer, target, 0)
return answer

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