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

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


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

a_max = 0
for i in range(N):
    new_a = copy.deepcopy(A)
    new_a.pop(i)
    a_max = max(a_max,gcd(*new_a))

print(a_max)


Fixed submission:
def gcd(x,y):
    if x % y == 0:
        return y
    else:
        x %= y
        return gcd(y, x)

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

l_gcd = [-1] * N
r_gcd = [-1] * N

for i in range(N):
    if i == 0:
        l_gcd [0] = blackboard[0]
    else:
        l_gcd[i] = gcd(l_gcd[i-1],blackboard[i])


for i in reversed(range(N)):
    if i == N - 1:
        r_gcd[N-1] = blackboard[N-1]
    else:
        r_gcd[i] = gcd(r_gcd[i+1],blackboard[i])


#左端と右端のときの値を予め比較しておく。
ans = max(l_gcd[-2],r_gcd[1])

for i in range(1,N-1):
    ans = max(ans,gcd(l_gcd[i-1],r_gcd[i+1]))
print(ans)

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

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


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


c = itertools.combinations(A, N-1)

a_max = gcd(*A)
for i in c:
    a_max = max(a_max, gcd(*list(i)))

print(a_max)


Fixed submission:
def gcd(x,y):
    if x % y == 0:
        return y
    else:
        x %= y
        return gcd(y, x)

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

l_gcd = [-1] * N
r_gcd = [-1] * N

for i in range(N):
    if i == 0:
        l_gcd [0] = blackboard[0]
    else:
        l_gcd[i] = gcd(l_gcd[i-1],blackboard[i])


for i in reversed(range(N)):
    if i == N - 1:
        r_gcd[N-1] = blackboard[N-1]
    else:
        r_gcd[i] = gcd(r_gcd[i+1],blackboard[i])


#左端と右端のときの値を予め比較しておく。
ans = max(l_gcd[-2],r_gcd[1])

for i in range(1,N-1):
    ans = max(ans,gcd(l_gcd[i-1],r_gcd[i+1]))
print(ans)

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

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



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


c = itertools.combinations(A, N-1)

a_max = gcd(*A)
for i in c:
    a_max = max(a_max, gcd(*list(i)))

print(a_max)


Fixed submission:
def gcd(x,y):
    if x % y == 0:
        return y
    else:
        x %= y
        return gcd(y, x)

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

l_gcd = [-1] * N
r_gcd = [-1] * N

for i in range(N):
    if i == 0:
        l_gcd [0] = blackboard[0]
    else:
        l_gcd[i] = gcd(l_gcd[i-1],blackboard[i])


for i in reversed(range(N)):
    if i == N - 1:
        r_gcd[N-1] = blackboard[N-1]
    else:
        r_gcd[i] = gcd(r_gcd[i+1],blackboard[i])


#左端と右端のときの値を予め比較しておく。
ans = max(l_gcd[-2],r_gcd[1])

for i in range(1,N-1):
    ans = max(ans,gcd(l_gcd[i-1],r_gcd[i+1]))
print(ans)

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

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



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


c = itertools.combinations(A, N-1)

a_max = gcd(*A)
for i in c:
    a_max = max(a_max, gcd(*list(i)))

print(a_max)


Fixed submission:
def gcd(x,y):
    if x % y == 0:
        return y
    else:
        x %= y
        return gcd(y, x)

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

l_gcd = [-1] * N
r_gcd = [-1] * N

for i in range(N):
    if i == 0:
        l_gcd [0] = blackboard[0]
    else:
        l_gcd[i] = gcd(l_gcd[i-1],blackboard[i])


for i in reversed(range(N)):
    if i == N - 1:
        r_gcd[N-1] = blackboard[N-1]
    else:
        r_gcd[i] = gcd(r_gcd[i+1],blackboard[i])


#左端と右端のときの値を予め比較しておく。
ans = max(l_gcd[-2],r_gcd[1])

for i in range(1,N-1):
    ans = max(ans,gcd(l_gcd[i-1],r_gcd[i+1]))
print(ans)