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

n = int(input())
a = list(map(int, input().split()))
fromLeft = [0] * n
fromLeft[0] = a[0]
fromRight = [0] * n
fromRight[0] = a[n - 1]
for i in range(1, n):
    fromLeft[i] = gcd(fromLeft[i - 1], a[i])
    fromRight[i] = gcd(fromRight[i - 1], a[n - i - 1])
ret = fromLeft[n - 1]
for i in range(n):
    if i == 0:
        curGcd = fromRight[n - 2]
    elif i == n - 1:
        curGcd = fromLeft[n - 2]
    else:
        curGcd = gcd(fromLeft[i - 1], fromRight[n - i - 2])
    ret = max(ret, curGcd)
print(ret)


Fixed submission:
def gcd(x, y):
    while (y):
        x, y = y, x % y
    return x

n = int(input())
a = list(map(int, input().split()))
fromLeft = [0] * n
fromLeft[0] = a[0]
fromRight = [0] * n
fromRight[0] = a[n - 1]
for i in range(1, n):
    fromLeft[i] = gcd(fromLeft[i - 1], a[i])
    fromRight[i] = gcd(fromRight[i - 1], a[n - i - 1])
ret = fromLeft[n - 1]
for i in range(n):
    if i == 0:
        curGcd = fromRight[n - 2]
    elif i == n - 1:
        curGcd = fromLeft[n - 2]
    else:
        curGcd = gcd(fromLeft[i - 1], fromRight[n - i - 2])
    ret = max(ret, curGcd)
print(ret)

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

n = int(input())
a = list(map(int, input().split()))
fromLeft = [0] * n
fromLeft[0] = a[0]
for i in range(1, n):
    fromLeft[i] = gcd(fromLeft[i - 1], a[i])
fromRight = [0] * n
fromRight[n - 1] = a[n - 1]
for i in range(n - 2, -1, -1):
    fromRight[i] = gcd(fromRight[i + 1], a[i])
ret = 0
for i in range(n):
    if i == 0:
        curGcd = fromRight[i + 1]
    elif i == n - 1:
        curGcd = fromLeft[n - 2]
    else:
        curGcd = gcd(fromLeft[i - 1], fromRight[n - i])
    ret = max(ret, curGcd)
print(ret)

Fixed submission:
def gcd(x, y):
    while (y):
        x, y = y, x % y
    return x

n = int(input())
a = list(map(int, input().split()))
fromLeft = [0] * n
fromLeft[0] = a[0]
fromRight = [0] * n
fromRight[0] = a[n - 1]
for i in range(1, n):
    fromLeft[i] = gcd(fromLeft[i - 1], a[i])
    fromRight[i] = gcd(fromRight[i - 1], a[n - i - 1])
ret = fromLeft[n - 1]
for i in range(n):
    if i == 0:
        curGcd = fromRight[n - 2]
    elif i == n - 1:
        curGcd = fromLeft[n - 2]
    else:
        curGcd = gcd(fromLeft[i - 1], fromRight[n - i - 2])
    ret = max(ret, curGcd)
print(ret)

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

n = int(input())
a = list(map(int, input().split()))
fromLeft = [0] * n
fromLeft[0] = a[0]
for i in range(1, n):
    fromLeft[i] = gcd(fromLeft[i - 1], a[i])
fromRight = [0] * n
fromRight[n - 1] = a[n - 1]
for i in range(n - 2, -1, -1):
    fromRight[i] = gcd(fromRight[i + 1], a[i])
ret = 0
for i in range(n):
    if i == 0:
        curGcd = fromRight[n - 2]
    elif i == n - 1:
        curGcd = fromLeft[n - 2]
    else:
        curGcd = gcd(fromLeft[i - 1], fromRight[n - i])
    ret = max(ret, curGcd)
print(ret)

Fixed submission:
def gcd(x, y):
    while (y):
        x, y = y, x % y
    return x

n = int(input())
a = list(map(int, input().split()))
fromLeft = [0] * n
fromLeft[0] = a[0]
fromRight = [0] * n
fromRight[0] = a[n - 1]
for i in range(1, n):
    fromLeft[i] = gcd(fromLeft[i - 1], a[i])
    fromRight[i] = gcd(fromRight[i - 1], a[n - i - 1])
ret = fromLeft[n - 1]
for i in range(n):
    if i == 0:
        curGcd = fromRight[n - 2]
    elif i == n - 1:
        curGcd = fromLeft[n - 2]
    else:
        curGcd = gcd(fromLeft[i - 1], fromRight[n - i - 2])
    ret = max(ret, curGcd)
print(ret)

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

n = int(input())
a = list(map(int, input().split()))
fromLeft = [0] * n
fromLeft[0] = a[0]
for i in range(1, n):
    fromLeft[i] = gcd(fromLeft[i - 1], a[i])
fromRight = [0] * n
fromRight[n - 1] = a[n - 1]
for i in range(n - 2, -1, -1):
    fromRight[i] = gcd(fromRight[i + 1], a[i])
ret = 0
for i in range(n):
    if i == 0:
        curGcd = fromRight[n - 2]
    elif i == n - 1:
        curGcd = fromLeft[n - 2]
    else:
        curGcd = gcd(fromLeft[i - 1], fromRight[n - i])
    ret = max(ret, curGcd)
print(ret)

Fixed submission:
def gcd(x, y):
    while (y):
        x, y = y, x % y
    return x

n = int(input())
a = list(map(int, input().split()))
fromLeft = [0] * n
fromLeft[0] = a[0]
fromRight = [0] * n
fromRight[0] = a[n - 1]
for i in range(1, n):
    fromLeft[i] = gcd(fromLeft[i - 1], a[i])
    fromRight[i] = gcd(fromRight[i - 1], a[n - i - 1])
ret = fromLeft[n - 1]
for i in range(n):
    if i == 0:
        curGcd = fromRight[n - 2]
    elif i == n - 1:
        curGcd = fromLeft[n - 2]
    else:
        curGcd = gcd(fromLeft[i - 1], fromRight[n - i - 2])
    ret = max(ret, curGcd)
print(ret)