Buggy python submission (verdict: Time Limit Exceeded):
def gcd(a,b):
  while b!=0:
    a,b=b,a%b
  return a

N = int(input())
A= list(map(int,input().split()))
output=0

for i in range(N):
        M = [A[i-1]]
        hoge = A[i]
        A[i] = A[i-1]
        for k in range(N):
                M.append(gcd(M[k],A[k]))

        if M[N] >= output:
                output = M[N]
        A[i]=hoge

print(output)

Fixed submission:
def gcd(a,b):
  while b!=0:
    a,b=b,a%b
  return a

N = int(input())
A= list(map(int,input().split()))
output=0
KA=[0 for i in range(N)]
LA=[0 for i in range(N)]
GCD = []

for k in range(1,N):
        LA[k]=gcd(A[k-1],LA[k-1])

for k in range(1,N):
        KA[k]=gcd(A[N-k],KA[k-1])


for k in range(N):
        GCD.append(gcd(LA[k],KA[N-k-1]))
output = max(GCD)
print(output)

Buggy python submission (verdict: Runtime Error):
def gcd(a,b):
  while b!=0:
    a,b=b,a%b
  return a

N = int(input())
A= list(map(int,input().split()))
output=0

for i in range(N):
        M = [A[i-1]]
        hoge = A[i]
        A[i] = A[i-1]
        for k in range(N):
                M.append(gcd(M[k],A[k]))
                print(M)

        if M[N] >= output:
                output = M[N]
        A[i]=hoge

print(output)

Fixed submission:
def gcd(a,b):
  while b!=0:
    a,b=b,a%b
  return a

N = int(input())
A= list(map(int,input().split()))
output=0
KA=[0 for i in range(N)]
LA=[0 for i in range(N)]
GCD = []

for k in range(1,N):
        LA[k]=gcd(A[k-1],LA[k-1])

for k in range(1,N):
        KA[k]=gcd(A[N-k],KA[k-1])


for k in range(N):
        GCD.append(gcd(LA[k],KA[N-k-1]))
output = max(GCD)
print(output)

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

def gcd(a,b):
  while b!=0:
    a,b=b,a%b
  return a


def gcd_list(numbers):
    return reduce(gcd, numbers)

N = int(input())
A= list(map(int,input().split()))
output=0


for i in range(N):
        hoge = A[i]
        A[i] = A[i-1]
        if gcd_list(A) >= output:
                output = gcd_list(A)
        A[i]=hoge

print(output)

Fixed submission:
def gcd(a,b):
  while b!=0:
    a,b=b,a%b
  return a

N = int(input())
A= list(map(int,input().split()))
output=0
KA=[0 for i in range(N)]
LA=[0 for i in range(N)]
GCD = []

for k in range(1,N):
        LA[k]=gcd(A[k-1],LA[k-1])

for k in range(1,N):
        KA[k]=gcd(A[N-k],KA[k-1])


for k in range(N):
        GCD.append(gcd(LA[k],KA[N-k-1]))
output = max(GCD)
print(output)

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

def gcd(numbers):
    return reduce(math.gcd, numbers)

N = int(input())
A= list(map(int,input().split()))
output=0


for i in range(N):
        hoge = A[i]
        A[i] = A[i-1]
        if gcd(A) >= output:
                output = gcd(A)
        A[i]=hoge

print(output)

Fixed submission:
def gcd(a,b):
  while b!=0:
    a,b=b,a%b
  return a

N = int(input())
A= list(map(int,input().split()))
output=0
KA=[0 for i in range(N)]
LA=[0 for i in range(N)]
GCD = []

for k in range(1,N):
        LA[k]=gcd(A[k-1],LA[k-1])

for k in range(1,N):
        KA[k]=gcd(A[N-k],KA[k-1])


for k in range(N):
        GCD.append(gcd(LA[k],KA[N-k-1]))
output = max(GCD)
print(output)