Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3
import sys
import functools
from math import gcd
# from fractions import gcd
 
def solve(N: int, A: "List[int]"):
    L = [0] * (N)
    R = [0] * (N)
 
    L[0] = A[0]
    for i in range(1, N):
        L[i] = gcd(L[i-1], A[i-1])
 
    R[N-1] = A[N-1]
    for i in reversed(range(0,N-1)):
        R[i] = gcd(R[i+1], A[i+1])
 
    # print(L)
    # print(R)
 
    ans = 0
    for i in range(N):
        ans = max(ans, gcd(L[i], R[i]))
 
    print(ans)
 
    return
 
 
# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(N) ]  # type: "List[int]"
    solve(N, A)
 
if __name__ == '__main__':
    main()

Fixed submission:
#!/usr/bin/env python3
import sys
import functools
# from math import gcd
# from fractions import gcd

def gcd(x,y):
    if x<y:
        x,y=y,x
    #x>y
    if y==0:
        return x
    if x%y==0:
        return y
    else:
        return gcd(y,x%y)
 
def solve(N: int, A: "List[int]"):
    L = [0] * (N)
    R = [0] * (N)
 
    for i in range(1, N):
        L[i] = gcd(L[i-1], A[i-1])
    for i in reversed(range(0,N-1)):
        R[i] = gcd(R[i+1], A[i+1])
 
    # print(L)
    # print(R)
 
    ans = 0
    for i in range(N):
        ans = max(ans, gcd(L[i], R[i]))
 
    print(ans)
 
    return
 
 
# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(N) ]  # type: "List[int]"
    solve(N, A)
 
if __name__ == '__main__':
    main()

Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3
import sys
import functools,math


def solve(N: int, A: "List[int]"):
    L = [0] * (N+2)
    R = [0] * (N+2)

    L[1] = A[0]
    for i in range(2,N+1):
        L[i] = math.gcd(L[i-1], A[i-1])

    R[N] = A[N-1]
    for i in reversed(range(0,N+1)):
        R[i] = math.gcd(A[i-1], R[i+1])

    # print(L)
    # print(R)

    ans = 0
    for i in range(1,N):
        if(L[i-1] == 0):
            ans = max(ans, R[i+1])
        elif(R[i-1] == 0):
            ans = max(ans, R[i-1])
        else:
            ans = max(ans, math.gcd(L[i-1], R[i+1]))

    print(ans)

    return


# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(N) ]  # type: "List[int]"
    solve(N, A)

if __name__ == '__main__':
    main()


Fixed submission:
#!/usr/bin/env python3
import sys
import functools
# from math import gcd
# from fractions import gcd

def gcd(x,y):
    if x<y:
        x,y=y,x
    #x>y
    if y==0:
        return x
    if x%y==0:
        return y
    else:
        return gcd(y,x%y)
 
def solve(N: int, A: "List[int]"):
    L = [0] * (N)
    R = [0] * (N)
 
    for i in range(1, N):
        L[i] = gcd(L[i-1], A[i-1])
    for i in reversed(range(0,N-1)):
        R[i] = gcd(R[i+1], A[i+1])
 
    # print(L)
    # print(R)
 
    ans = 0
    for i in range(N):
        ans = max(ans, gcd(L[i], R[i]))
 
    print(ans)
 
    return
 
 
# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(N) ]  # type: "List[int]"
    solve(N, A)
 
if __name__ == '__main__':
    main()