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def gcd(numbers):
"""Return the greatest common divisor for a given list of integers.
Arguments:
numbers {list} -- list of integers
Returns:
gcd {int} -- greatest common divisor
"""
gcd = 1
absValues = [abs(i) for i in numbers]
smallest = min(absValues)
if numbers[0] >= 0:
for i in range(smallest, 1, -1):
if all(number % i == 0 for number in absValues) is True:
gcd = i
break
else:
for i in range(-smallest, -1):
if all(number % i == 0 for number in absValues) is True:
gcd = i
break
return gcd
def factors(number):
"""Return the factors list for given number.
Arguments:
number {int} -- an integer
Returns:
factors {list} -- list of numbers dividing the given number
"""
factors = []
for i in range(1, int(abs(number)**0.5) + 1):
if number % i == 0:
factors.extend([i, number // i])
factors.sort()
return factors
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