Buggy python submission (verdict: Time Limit Exceeded):
import fractions
from functools import reduce

n = int(input())
aList = list(map(int, input().split()))

def gcd_numbers(numbers):
    return reduce(fractions.gcd, numbers)

ans = 0
if n == 2:
    ans = max(aList)
else:
    for i in range(0,n):
        tmp = aList.pop(0)
        r = gcd_numbers(aList)
        if ans < r:
            ans = r
        aList.append(tmp)

print(ans)

Fixed submission:
import fractions

n = int(input())
aList = list(map(int, input().split()))

def gcd3(nums):
    ans1 = fractions.gcd(nums[0], nums[1])
    ans2 = fractions.gcd(nums[0], nums[2])
    ans3 = fractions.gcd(nums[1], nums[2])

    if ans1 >= ans2 and ans1 >= ans3:
        return ans1, nums[2]
    if ans2 >= ans1 and ans2 >= ans3:
        return ans2, nums[1]
    if ans3 >= ans1 and ans3 >= ans2:
        return ans3, nums[0]

ans = 0
if n == 2:
    ans = max(aList)
else:
    sList = []
    sList.append(aList.pop(0))
    sList.append(aList.pop(0))
    sList.append(aList.pop(0))
    ans, v = gcd3(sList)

    for i in range(len(aList)):
        tmp = aList.pop(0)
        tmp1 = fractions.gcd(ans, v)
        tmp2 = fractions.gcd(ans, tmp)
        if tmp1 >= tmp2:
            ans = tmp1
            v = tmp
        else:
            ans = tmp2

print(ans)

Buggy python submission (verdict: Runtime Error):
import math
from functools import reduce

n = int(input())
aList = list(map(int, input().split()))

def gcd(numbers):
    return reduce(math.gcd, numbers)

ans = 0
if n == 2:
    ans = max(aList)
else:
    for i in range(0,n):
        tmp = aList.pop(0)
        r = gcd(aList)
        if ans < r:
            ans = r
        aList.append(tmp)

print(ans)

Fixed submission:
import fractions

n = int(input())
aList = list(map(int, input().split()))

def gcd3(nums):
    ans1 = fractions.gcd(nums[0], nums[1])
    ans2 = fractions.gcd(nums[0], nums[2])
    ans3 = fractions.gcd(nums[1], nums[2])

    if ans1 >= ans2 and ans1 >= ans3:
        return ans1, nums[2]
    if ans2 >= ans1 and ans2 >= ans3:
        return ans2, nums[1]
    if ans3 >= ans1 and ans3 >= ans2:
        return ans3, nums[0]

ans = 0
if n == 2:
    ans = max(aList)
else:
    sList = []
    sList.append(aList.pop(0))
    sList.append(aList.pop(0))
    sList.append(aList.pop(0))
    ans, v = gcd3(sList)

    for i in range(len(aList)):
        tmp = aList.pop(0)
        tmp1 = fractions.gcd(ans, v)
        tmp2 = fractions.gcd(ans, tmp)
        if tmp1 >= tmp2:
            ans = tmp1
            v = tmp
        else:
            ans = tmp2

print(ans)

Buggy python submission (verdict: Runtime Error):
import math
from functools import reduce

n = int(input())
aList = list(map(int, input().split()))

def gcd(numbers):
    return reduce(math.gcd, numbers)

ans = 0
if n == 2:
    ans = max(aList)
else:
    for i in range(0,n-1):
        tmp = aList.pop(0)
        r = gcd(aList)
        if ans < r:
            ans = r
        aList.append(tmp)

print(ans)
    

Fixed submission:
import fractions

n = int(input())
aList = list(map(int, input().split()))

def gcd3(nums):
    ans1 = fractions.gcd(nums[0], nums[1])
    ans2 = fractions.gcd(nums[0], nums[2])
    ans3 = fractions.gcd(nums[1], nums[2])

    if ans1 >= ans2 and ans1 >= ans3:
        return ans1, nums[2]
    if ans2 >= ans1 and ans2 >= ans3:
        return ans2, nums[1]
    if ans3 >= ans1 and ans3 >= ans2:
        return ans3, nums[0]

ans = 0
if n == 2:
    ans = max(aList)
else:
    sList = []
    sList.append(aList.pop(0))
    sList.append(aList.pop(0))
    sList.append(aList.pop(0))
    ans, v = gcd3(sList)

    for i in range(len(aList)):
        tmp = aList.pop(0)
        tmp1 = fractions.gcd(ans, v)
        tmp2 = fractions.gcd(ans, tmp)
        if tmp1 >= tmp2:
            ans = tmp1
            v = tmp
        else:
            ans = tmp2

print(ans)