Not sure if this is efficient
from itertools import combinations, chain def solve(numbers): combs = [list(combinations(numbers, x)) for x in range(1,len(numbers) + 1)] flattened_combs = list(chain.from_iterable(combs)) sums = [sum(x) for x in flattened_combs] x = 1 while(x in sums): x = x + 1 return x
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Not sure if this is efficient