Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

def gcd(a,b):
    while b!=0:
        a,b=b,a%b
    return a

N = int(input())
A = deque(list(map(int, input().split())))

gcd_max=1

import functools

prefix_gcd = 0
post = A
for i in range(N):
    a = post.popleft()
    if len(post) == 0:
        postfix_gcd = 0
    elif len(post) == 1:
        postfix_gcd = post[0]
    else:
        postfix_gcd = functools.reduce(gcd, post)
    if postfix_gcd == 0:
        gcd_max = max(gcd_max, prefix_gcd)
    if prefix_gcd > 0:
        gcd_max = max(gcd_max, gcd(prefix_gcd, postfix_gcd))
        prefix_gcd = gcd(prefix_gcd, a)
    else:
        gcd_max = max(gcd_max, postfix_gcd)
        prefix_gcd = a

print(gcd_max)


Fixed submission:
from collections import deque
from copy import copy
from array import array

def gcd(a,b):
    while b!=0:
        a,b=b,a%b
    return a

N = int(input())
A = list(map(int, input().split()))

def get_prefix_gcd_list(Adeque):
    prefix_gcd = array('i', [0]*N)
    # marker
    prefix_gcd[0] = 0
    # the first itself is gcd
    prefix_gcd[1] = Adeque.popleft()
    for i in range(2,N):
        a = Adeque.popleft()
        prefix_gcd[i] = gcd(prefix_gcd[i-1], a)
        pass
    return prefix_gcd
        
    
# PREFIX_GCD[i]...i より前の要素のGCD
PREFIX_GCD = get_prefix_gcd_list(deque(copy(A)))

# PREFIX_GCD[i]...i より後の要素のGCD
POSTFIX_GCD=list(reversed(get_prefix_gcd_list(deque(reversed(A)))))

gcd_max=1

for i in range(N):
    pre = PREFIX_GCD[i]
    pos = POSTFIX_GCD[i]
    if pre == 0:
        _gcd = pos
    elif pos == 0:
        _gcd = pre
    else:
        _gcd = gcd(pre,pos)
    gcd_max = max(gcd_max, _gcd)
        
print(gcd_max)

Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

def gcd(a,b):
    while b!=0:
        a,b=b,a%b
    return a

N = int(input())
A = deque(list(map(int, input().split())))

gcd_max=1

import functools
import math

for i in range(N):
    a = A.popleft()
    gcd_max = max(gcd_max, functools.reduce(gcd, A))
    A.append(a)

print(gcd_max)


Fixed submission:
from collections import deque
from copy import copy
from array import array

def gcd(a,b):
    while b!=0:
        a,b=b,a%b
    return a

N = int(input())
A = list(map(int, input().split()))

def get_prefix_gcd_list(Adeque):
    prefix_gcd = array('i', [0]*N)
    # marker
    prefix_gcd[0] = 0
    # the first itself is gcd
    prefix_gcd[1] = Adeque.popleft()
    for i in range(2,N):
        a = Adeque.popleft()
        prefix_gcd[i] = gcd(prefix_gcd[i-1], a)
        pass
    return prefix_gcd
        
    
# PREFIX_GCD[i]...i より前の要素のGCD
PREFIX_GCD = get_prefix_gcd_list(deque(copy(A)))

# PREFIX_GCD[i]...i より後の要素のGCD
POSTFIX_GCD=list(reversed(get_prefix_gcd_list(deque(reversed(A)))))

gcd_max=1

for i in range(N):
    pre = PREFIX_GCD[i]
    pos = POSTFIX_GCD[i]
    if pre == 0:
        _gcd = pos
    elif pos == 0:
        _gcd = pre
    else:
        _gcd = gcd(pre,pos)
    gcd_max = max(gcd_max, _gcd)
        
print(gcd_max)

Buggy python submission (verdict: Runtime Error):
from collections import deque
    
N = int(input())
A = deque(list(map(int, input().split())))

gcd_max=1

import functools
import math

for i in range(N):
    a = A.popleft()
    gcd_max = max(gcd_max, functools.reduce(math.gcd, A))
    A.append(a)

print(gcd_max)


Fixed submission:
from collections import deque
from copy import copy
from array import array

def gcd(a,b):
    while b!=0:
        a,b=b,a%b
    return a

N = int(input())
A = list(map(int, input().split()))

def get_prefix_gcd_list(Adeque):
    prefix_gcd = array('i', [0]*N)
    # marker
    prefix_gcd[0] = 0
    # the first itself is gcd
    prefix_gcd[1] = Adeque.popleft()
    for i in range(2,N):
        a = Adeque.popleft()
        prefix_gcd[i] = gcd(prefix_gcd[i-1], a)
        pass
    return prefix_gcd
        
    
# PREFIX_GCD[i]...i より前の要素のGCD
PREFIX_GCD = get_prefix_gcd_list(deque(copy(A)))

# PREFIX_GCD[i]...i より後の要素のGCD
POSTFIX_GCD=list(reversed(get_prefix_gcd_list(deque(reversed(A)))))

gcd_max=1

for i in range(N):
    pre = PREFIX_GCD[i]
    pos = POSTFIX_GCD[i]
    if pre == 0:
        _gcd = pos
    elif pos == 0:
        _gcd = pre
    else:
        _gcd = gcd(pre,pos)
    gcd_max = max(gcd_max, _gcd)
        
print(gcd_max)

Buggy python submission (verdict: Runtime Error):
from collections import deque
from copy import copy

def gcd(a,b):
    while b!=0:
        a,b=b,a%b
    return a

def gcd_of_array(_array):
    _array_copy = copy(_array)
    array_of_gcd = deque([])
    n = len(_array_copy)
    if n == 1:
        return _array[0]
    if n % 2 == 1:
        a = _array_copy.pop()
        array_of_gcd.append(a)
    for i in range(0,N-1,2):
        array_of_gcd.append(gcd(_array_copy.pop(),_array_copy.pop()))

    return gcd_of_array(array_of_gcd)

    
N = int(input())
A = deque(list(map(int, input().split())))

gcd_max=1

for i in range(N):
    a = A.popleft()
    gcd_max = max(gcd_max, gcd_of_array(A))
    A.append(a)

print(gcd_max)


Fixed submission:
from collections import deque
from copy import copy
from array import array

def gcd(a,b):
    while b!=0:
        a,b=b,a%b
    return a

N = int(input())
A = list(map(int, input().split()))

def get_prefix_gcd_list(Adeque):
    prefix_gcd = array('i', [0]*N)
    # marker
    prefix_gcd[0] = 0
    # the first itself is gcd
    prefix_gcd[1] = Adeque.popleft()
    for i in range(2,N):
        a = Adeque.popleft()
        prefix_gcd[i] = gcd(prefix_gcd[i-1], a)
        pass
    return prefix_gcd
        
    
# PREFIX_GCD[i]...i より前の要素のGCD
PREFIX_GCD = get_prefix_gcd_list(deque(copy(A)))

# PREFIX_GCD[i]...i より後の要素のGCD
POSTFIX_GCD=list(reversed(get_prefix_gcd_list(deque(reversed(A)))))

gcd_max=1

for i in range(N):
    pre = PREFIX_GCD[i]
    pos = POSTFIX_GCD[i]
    if pre == 0:
        _gcd = pos
    elif pos == 0:
        _gcd = pre
    else:
        _gcd = gcd(pre,pos)
    gcd_max = max(gcd_max, _gcd)
        
print(gcd_max)

Buggy python submission (verdict: Runtime Error):
from collections import deque
from copy import copy
from copy import deepcopy

def gcd(a,b):
    while b!=0:
        a,b=b,a%b
    return a

def gcd_of_array(_array):
    _array_copy = _array.copy()
    array_of_gcd = deque([])
    n = len(_array_copy)
    if n == 1:
        return _array[0]
    if n % 2 == 1:
        a = _array_copy.pop()
        array_of_gcd.append(a)
    for i in range(0,N-1,2):
        array_of_gcd.append(gcd(_array_copy.pop(),_array_copy.pop()))

    return gcd_of_array(array_of_gcd)

    
N = int(input())
A = deque(list(map(int, input().split())))

gcd_max=1

for i in range(N):
    a = A.popleft()
    gcd_max = max(gcd_max, gcd_of_array(A))
    A.append(a)

print(gcd_max)


Fixed submission:
from collections import deque
from copy import copy
from array import array

def gcd(a,b):
    while b!=0:
        a,b=b,a%b
    return a

N = int(input())
A = list(map(int, input().split()))

def get_prefix_gcd_list(Adeque):
    prefix_gcd = array('i', [0]*N)
    # marker
    prefix_gcd[0] = 0
    # the first itself is gcd
    prefix_gcd[1] = Adeque.popleft()
    for i in range(2,N):
        a = Adeque.popleft()
        prefix_gcd[i] = gcd(prefix_gcd[i-1], a)
        pass
    return prefix_gcd
        
    
# PREFIX_GCD[i]...i より前の要素のGCD
PREFIX_GCD = get_prefix_gcd_list(deque(copy(A)))

# PREFIX_GCD[i]...i より後の要素のGCD
POSTFIX_GCD=list(reversed(get_prefix_gcd_list(deque(reversed(A)))))

gcd_max=1

for i in range(N):
    pre = PREFIX_GCD[i]
    pos = POSTFIX_GCD[i]
    if pre == 0:
        _gcd = pos
    elif pos == 0:
        _gcd = pre
    else:
        _gcd = gcd(pre,pos)
    gcd_max = max(gcd_max, _gcd)
        
print(gcd_max)