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

import fractions

def longgcd(S):
    if len(S)==2:
        return fractions.gcd(S[0],S[1])
    else:
        x=S[0]
        for i in range(0,N):
            x=fractions.gcd(x,S[i])
        return x

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

m=0

for i in range(0,N):
    B=copy.copy(A)
    B[i]=0
    x=longgcd(B)
    if x>m:
        m=x
print(m)


Fixed submission:
def gcd(n,m):#n,mは正の整数、最大公約数　許容は？
    if n==0:
        return m
    elif m==0:
        return n
    elif n>m:
        n=n%m
        return gcd(n,m)
    else:
        m=m%n
        return gcd(n,m)

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

list1=[1 for i in range(0,N)]
list2=[1 for i in range(0,N)]
list1[0]=A[0]
list2[0]=A[N-1]

for i in range(1,N):
    list1[i]=gcd(list1[i-1],A[i])
    list2[i]=gcd(list2[i-1],A[N-1-i])
m=list2[N-2]
for i in range(0,N-2):
    test=gcd(list1[i],list2[N-3-i])
    if test>m:
        m=test
test=list1[N-2]
if test>m:
    m=test
print(m)

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

import math

def longgcd(S):
    if len(S)==2:
        return math.gcd(S[0],S[1])
    else:
        x=S[0]
        for i in range(0,N):
            x=math.gcd(x,S[i])
        return x

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

m=0

for i in range(0,N):
    B=copy.copy(A)
    B[i]=0
    x=longgcd(B)
    if x>m:
        m=x
print(m)


Fixed submission:
def gcd(n,m):#n,mは正の整数、最大公約数　許容は？
    if n==0:
        return m
    elif m==0:
        return n
    elif n>m:
        n=n%m
        return gcd(n,m)
    else:
        m=m%n
        return gcd(n,m)

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

list1=[1 for i in range(0,N)]
list2=[1 for i in range(0,N)]
list1[0]=A[0]
list2[0]=A[N-1]

for i in range(1,N):
    list1[i]=gcd(list1[i-1],A[i])
    list2[i]=gcd(list2[i-1],A[N-1-i])
m=list2[N-2]
for i in range(0,N-2):
    test=gcd(list1[i],list2[N-3-i])
    if test>m:
        m=test
test=list1[N-2]
if test>m:
    m=test
print(m)

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

def gcd(n,m):#n,mは正の整数、最大公約数　許容は？
    if n==0:
        return m
    elif m==0:
        return n
    elif n>m:
        n=n%m
        return gcd(n,m)
    else:
        m=m%n
        return gcd(n,m)

def longgcd(S):
    if len(S)==2:
        return gcd(S[0],S[1])
    else:
        x=S[0]
        for i in range(0,N):
            x=gcd(x,S[i])
        return x

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

m=0

for i in range(0,N):
    B=copy.copy(A)
    B[i]=0
    x=longgcd(B)
    if x>m:
        m=x
print(m)

Fixed submission:
def gcd(n,m):#n,mは正の整数、最大公約数　許容は？
    if n==0:
        return m
    elif m==0:
        return n
    elif n>m:
        n=n%m
        return gcd(n,m)
    else:
        m=m%n
        return gcd(n,m)

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

list1=[1 for i in range(0,N)]
list2=[1 for i in range(0,N)]
list1[0]=A[0]
list2[0]=A[N-1]

for i in range(1,N):
    list1[i]=gcd(list1[i-1],A[i])
    list2[i]=gcd(list2[i-1],A[N-1-i])
m=list2[N-2]
for i in range(0,N-2):
    test=gcd(list1[i],list2[N-3-i])
    if test>m:
        m=test
test=list1[N-2]
if test>m:
    m=test
print(m)

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

def gcd(n,m):#n,mは正の整数、最大公約数　許容は？
    if n==0:
        return m
    elif m==0:
        return n
    elif n>m:
        n=n%m
        return gcd(n,m)
    else:
        m=m%n
        return gcd(n,m)

def longgcd(S):
    if len(S)==2:
        return gcd(S[0],S[1])
    else:
        s=S[len(S)-1]
        S.remove(S[len(S)-1])
        return gcd(s,longgcd(S))

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

m=0

for i in range(0,N):
    B=copy.copy(A)
    B[i]=0
    x=longgcd(B)
    if x>m:
        m=x
print(m)

Fixed submission:
def gcd(n,m):#n,mは正の整数、最大公約数　許容は？
    if n==0:
        return m
    elif m==0:
        return n
    elif n>m:
        n=n%m
        return gcd(n,m)
    else:
        m=m%n
        return gcd(n,m)

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

list1=[1 for i in range(0,N)]
list2=[1 for i in range(0,N)]
list1[0]=A[0]
list2[0]=A[N-1]

for i in range(1,N):
    list1[i]=gcd(list1[i-1],A[i])
    list2[i]=gcd(list2[i-1],A[N-1-i])
m=list2[N-2]
for i in range(0,N-2):
    test=gcd(list1[i],list2[N-3-i])
    if test>m:
        m=test
test=list1[N-2]
if test>m:
    m=test
print(m)