Buggy python submission (verdict: Time Limit Exceeded):
class ABSsegtree: # 必要な配列の長さN,単位元ie,関数(2項演算)func,を渡す    
    def __init__(self,N,ie,func):
        self.func=func
        self.getLEN=1 # Length of list
        while self.getLEN<N:
            self.getLEN*=2
        self.getsize=self.getLEN*2 # =len(ST)
        self.getLIN=self.getsize-self.getLEN # internal nodes without ST[0]
        self.ST=[ie]*self.getsize

    def update(self,i,x): # i(0-index)にxをいれる
        i+=self.getLIN
        self.ST[i]=x
        while i>1:
            i//=2
            self.ST[i]=self.func(self.ST[2*i],self.ST[2*i+1])
    
    def get_interval(self,a,b): # [a,b)での最小値を求めたい
        a+=self.getLIN
        b+=self.getLIN
        ret=self.func(self.ST[a],self.ST[b-1])
        while a+1<b: # 階層ごとに見る
            if a%2==1:
                ret=self.func(self.ST[a],ret)
                a+=1
            a//=2
            if b%2==1:
                ret=self.func(self.ST[b-1],ret)
            b//=2
        if a==b:
            pass
        else:
            ret=self.func(ret,self.ST[a])
        return ret
      
import fractions

N=int(input())
A=[int(a) for a in input().split()]

ins=ABSsegtree(N,0,fractions.gcd)
for i,a in enumerate(A):
  ins.update(i,a)
ans=0
for i,a in enumerate(A):
  ins.update(i,0)
  ans=max(ans,ins.get_interval(0,N))
  ins.update(i,a)
print(ans)
  

Fixed submission:
from fractions import gcd

n = int(input())
a = [int(i) for i in input().split()]

l = [0]
r = [0]
for i in range(n-1):
    l.append(gcd(l[i],a[i]))
    r.append(gcd(r[i],a[-1-i]))

m = 0
for i in range(n):
    m = max(m,gcd(l[i],r[-i-1]))

print(m)

Buggy python submission (verdict: Time Limit Exceeded):
from functools import reduce
from fractions import gcd

n = int(input())
a = [int(i) for i in input().split()]
ans = -1
for i in range(1,n+1):
    ans = max(ans,reduce(gcd,a[:i-1]+a[i:]))
print(ans)


Fixed submission:
from fractions import gcd

n = int(input())
a = [int(i) for i in input().split()]

l = [0]
r = [0]
for i in range(n-1):
    l.append(gcd(l[i],a[i]))
    r.append(gcd(r[i],a[-1-i]))

m = 0
for i in range(n):
    m = max(m,gcd(l[i],r[-i-1]))

print(m)

Buggy python submission (verdict: Time Limit Exceeded):
from functools import reduce
from fractions import gcd

n = int(input())
a = [int(i) for i in input().split()]
ans = -1
for i in range(1,n+1):
    ans = max(ans,reduce(gcd,a[:i-1]+a[i:]))
print(ans)


Fixed submission:
from fractions import gcd

n = int(input())
a = [int(i) for i in input().split()]

l = [0]
r = [0]
for i in range(n-1):
    l.append(gcd(l[i],a[i]))
    r.append(gcd(r[i],a[-1-i]))

m = 0
for i in range(n):
    m = max(m,gcd(l[i],r[-i-1]))

print(m)

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

n = int(input())
a = [int(i) for i in input().split()]
ans = -1
for i in range(1,n+1):
    ans = max(ans,reduce(gcd,a[:i-1]+a[i:]))
print(ans)


Fixed submission:
from fractions import gcd

n = int(input())
a = [int(i) for i in input().split()]

l = [0]
r = [0]
for i in range(n-1):
    l.append(gcd(l[i],a[i]))
    r.append(gcd(r[i],a[-1-i]))

m = 0
for i in range(n):
    m = max(m,gcd(l[i],r[-i-1]))

print(m)