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added algo for finding permutations of an array (#7614)

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Anshraj Shrivastava 2022-10-29 18:59:15 +05:30 committed by GitHub
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data_structures/arrays/permutations.py Normal file
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def permute(nums: list[int]) -> list[list[int]]:
"""
Return all permutations.
>>> from itertools import permutations
>>> numbers= [1,2,3]
>>> all(list(nums) in permute(numbers) for nums in permutations(numbers))
True
"""
result = []
if len(nums) == 1:
return [nums.copy()]
for _ in range(len(nums)):
n = nums.pop(0)
permutations = permute(nums)
for perm in permutations:
perm.append(n)
result.extend(permutations)
nums.append(n)
return result
if __name__ == "__main__":
import doctest
doctest.testmod()