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fix: the all_permutations in all_permutations.py #14595

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fix: the all_permutations in all_permutations.py #14595

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6 changes: 5 additions & 1 deletion backtracking/all_permutations.py
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,11 @@ def create_state_space_tree(
remove the comment to take an input from the user

print("Enter the elements")
sequence = list(map(int, input().split()))
MAX_SEQUENCE_LENGTH = 8
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@jgohel9902 jgohel9902 Apr 30, 2026

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Consider moving MAX_SEQUENCE_LENGTH to the module level instead of defining it inside this input block. That makes the limit easier to find, reuse, and update later.

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@anupamme anupamme May 1, 2026

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@orbisai0security can you address code review comments?

user_input = list(map(int, input().split()))
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@jgohel9902 jgohel9902 Apr 30, 2026

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This still only supports integer input from the user, while the function type hints allow both int and str. Consider documenting that interactive input only accepts integers, or update the parsing logic to support strings too.

if len(user_input) > MAX_SEQUENCE_LENGTH:
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@jgohel9902 jgohel9902 Apr 30, 2026

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The length check happens after converting all input values into a list. For very large input, this still loads everything into memory first. Consider checking the split input length before mapping to integers.

raise ValueError(f"Input sequence too long (max {MAX_SEQUENCE_LENGTH} elements).")
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@jgohel9902 jgohel9902 Apr 30, 2026

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Consider adding a test or doctest for the new length limit so this behavior is verified automatically and does not regress later.

sequence = user_input
"""

sequence: list[int | str] = [3, 1, 2, 4]
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