Buggy python submission (verdict: Runtime Error):
from　fractions import gcd
n = int(input())
a = list(map(int, input().split()))
gcd_l = a[0]
gcd_r = a[-1]
gcd_l_li = []
gcd_r_li = []
for i in range(n):
    gcd_l = gcd(gcd_l, a[i])
    gcd_l_li.append(gcd_l)
for i in range(n)[::-1]:
    gcd_r = gcd(gcd_r, a[i])
    gcd_r_li.append(gcd_r)
#print(gcd_l_li)
#print(gcd_r_li)

ans = max(gcd_r_li[n-2], gcd_l_li[n-2])  # かきかえる整数が右端のときと左端のとき
for target in range(1, n-1):
    ans = max(ans, gcd(gcd_l_li[target-1], gcd_r_li[target-1]))
print(ans)




Fixed submission:
from fractions import gcd
n = int(input())
a = list(map(int, input().split()))
gcd_l = a[0]
gcd_r = a[-1]
gcd_l_li = []
gcd_r_li = []
for i in range(n):
    gcd_l = gcd(gcd_l, a[i])
    gcd_l_li.append(gcd_l)
for i in range(n)[::-1]:
    gcd_r = gcd(gcd_r, a[i])
    gcd_r_li.append(gcd_r)
#print(gcd_l_li)
#print(gcd_r_li)

ans = max(gcd_r_li[n-2], gcd_l_li[n-2])  # かきかえる整数が右端のときと左端のとき
for target in range(1, n-1):
    ans = max(ans, gcd(gcd_l_li[target-1], gcd_r_li[n-2-target]))
print(ans)

Buggy python submission (verdict: Runtime Error):
import math
n = int(input())
a = list(map(int, input().split()))
gcd_l = a[0]
gcd_r = a[-1]
gcd_l_li = []
gcd_r_li = []
for i in range(n):
    gcd_l = math.gcd(gcd_l, a[i])
    gcd_l_li.append(gcd_l)
for i in range(n)[::-1]:
    gcd_r = math.gcd(gcd_r, a[i])
    gcd_r_li.append(gcd_r)
#print(gcd_l_li)
#print(gcd_r_li)

ans = max(gcd_r_li[n-2], gcd_l_li[n-2])  # かきかえる整数が右端のときと左端のとき
for target in range(1, n-1):
    ans = max(ans, math.gcd(gcd_l_li[target-1], gcd_r_li[target-1]))
print(ans)




Fixed submission:
from fractions import gcd
n = int(input())
a = list(map(int, input().split()))
gcd_l = a[0]
gcd_r = a[-1]
gcd_l_li = []
gcd_r_li = []
for i in range(n):
    gcd_l = gcd(gcd_l, a[i])
    gcd_l_li.append(gcd_l)
for i in range(n)[::-1]:
    gcd_r = gcd(gcd_r, a[i])
    gcd_r_li.append(gcd_r)
#print(gcd_l_li)
#print(gcd_r_li)

ans = max(gcd_r_li[n-2], gcd_l_li[n-2])  # かきかえる整数が右端のときと左端のとき
for target in range(1, n-1):
    ans = max(ans, gcd(gcd_l_li[target-1], gcd_r_li[n-2-target]))
print(ans)

Buggy python submission (verdict: Runtime Error):
import math
n = int(input())
a = list(map(int, input().split()))
max_a = max(a)


def divisor(n):
    ass = []
    for i in range(1,int(n**0.5)+1):
        if n%i == 0:
            ass.append(i)
            if i**2 == n:
                continue
            ass.append(n//i)
    return ass #sortされていない


li = divisor(max_a)
li.sort(reverse=True)
#print(li)
ans = 0
for i in li:
    gcd = []
    for j in range(n):
        gcd.append(math.gcd(i, a[j]))
    if gcd.count(i) >= n-1 and ans < i:
        ans = i
print(ans)

Fixed submission:
from fractions import gcd
n = int(input())
a = list(map(int, input().split()))
gcd_l = a[0]
gcd_r = a[-1]
gcd_l_li = []
gcd_r_li = []
for i in range(n):
    gcd_l = gcd(gcd_l, a[i])
    gcd_l_li.append(gcd_l)
for i in range(n)[::-1]:
    gcd_r = gcd(gcd_r, a[i])
    gcd_r_li.append(gcd_r)
#print(gcd_l_li)
#print(gcd_r_li)

ans = max(gcd_r_li[n-2], gcd_l_li[n-2])  # かきかえる整数が右端のときと左端のとき
for target in range(1, n-1):
    ans = max(ans, gcd(gcd_l_li[target-1], gcd_r_li[n-2-target]))
print(ans)