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


def solve(N, A):
    max_gcd = 0
    gcd1memo = None
    for i in range(N):
        gcd1 = None
        if gcd1memo is not None:
            gcd1 = fractions.gcd(gcd1memo, A[i - 1])
        else:
            for a in A[0:i]:
                gcd1 = fractions.gcd(gcd1, a) if gcd1 is not None else a
        gcd1memo = gcd1
        if i == N - 1:
            gcd = gcd1
        else:
            gcd2 = None
            for a in A[i + 1: N]:
                gcd2 = fractions.gcd(gcd2, a) if gcd2 is not None else a
            if gcd1 is None:
                gcd = gcd2
            elif gcd2 is None:
                gcd = gcd1
            else:
                gcd = fractions.gcd(gcd1, gcd2)
        if gcd > max_gcd:
            max_gcd = gcd
    return max_gcd


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


Fixed submission:
from fractions import gcd


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

# l[i] := [0, i]の数のGCDメモ
l = [None for _ in range(N)]
l[0] = A[0]
for i in range(1, N):
    l[i] = gcd(l[i - 1], A[i])

# r[i] := [i, N - 1]の数のGCDメモ
r = [None for _ in range(N)]
r[N - 1] = A[N - 1]
for i in reversed(range(N - 1)):
    r[i] = gcd(r[i + 1], A[i])

ans = 0
for i in range(N):
    if i == 0:
        ans = max(ans, r[1])
    elif i == N - 1:
        ans = max(ans, l[N - 2])
    else:
        ans = max(ans, gcd(l[i - 1], r[i + 1]))
print(ans)

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


def solve(N, A):
    max_gcd = 0
    for i in range(N):
        lst = A[0:i]
        lst.extend(A[i + 1: N])
        gcd = lst[0]
        for j in range(1, len(lst)):
            gcd = fractions.gcd(gcd, lst[j])
        if gcd > max_gcd:
            max_gcd = gcd
    return max_gcd


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


Fixed submission:
from fractions import gcd


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

# l[i] := [0, i]の数のGCDメモ
l = [None for _ in range(N)]
l[0] = A[0]
for i in range(1, N):
    l[i] = gcd(l[i - 1], A[i])

# r[i] := [i, N - 1]の数のGCDメモ
r = [None for _ in range(N)]
r[N - 1] = A[N - 1]
for i in reversed(range(N - 1)):
    r[i] = gcd(r[i + 1], A[i])

ans = 0
for i in range(N):
    if i == 0:
        ans = max(ans, r[1])
    elif i == N - 1:
        ans = max(ans, l[N - 2])
    else:
        ans = max(ans, gcd(l[i - 1], r[i + 1]))
print(ans)

Buggy python submission (verdict: Runtime Error):
import math

def solve(N, A):
    max_gcd = 0
    for i in range(N):
        lst = A[0:i]
        lst.extend(A[i + 1: N])
        gcd = lst[0]
        for j in range(1, len(lst)):
            gcd = math.gcd(gcd, lst[j])
        if gcd > max_gcd:
            max_gcd = gcd
    return max_gcd


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

Fixed submission:
from fractions import gcd


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

# l[i] := [0, i]の数のGCDメモ
l = [None for _ in range(N)]
l[0] = A[0]
for i in range(1, N):
    l[i] = gcd(l[i - 1], A[i])

# r[i] := [i, N - 1]の数のGCDメモ
r = [None for _ in range(N)]
r[N - 1] = A[N - 1]
for i in reversed(range(N - 1)):
    r[i] = gcd(r[i + 1], A[i])

ans = 0
for i in range(N):
    if i == 0:
        ans = max(ans, r[1])
    elif i == N - 1:
        ans = max(ans, l[N - 2])
    else:
        ans = max(ans, gcd(l[i - 1], r[i + 1]))
print(ans)