Buggy python submission (verdict: Runtime Error):
from numpy import *
N=int(input())
A=array(input().split(),int64)
f=bitwise_xor.reduce
X=f(A)
A=hstack(([1<<i for i in range(60)if X>>i],A))
for k in range(60)[::-1]:
  b=1<<k
  j=A&b!=0
  i=where(j&(A<2*b))[0]
  if len(i):i=i[0];x=A[i];A[j]^=x;A[i]=x
r=f(A)
print(r+(r^X))

Fixed submission:
import sys
input = sys.stdin.readline
sys.setrecursionlimit(10 ** 7)

import numpy as np

N = int(input())
A = np.array([int(x) for x in input().split()],dtype=np.int64)

"""
F_2 上の線形代数。基本変形で簡単な基底を得る。
"""

xor = np.bitwise_xor.reduce(A)

A = np.concatenate([np.array([1<<i for i in range(60) if xor&(1<<i)],np.int64),A])

for k in range(60,-1,-1):
    bit = 1<<k
    one = (A&bit != 0)
    i = np.where(one & (A < (1<<(k+1))))[0]
    if len(i) == 0:
        continue
    i = i[0]
    x = A[i]
    A[one] ^= x
    A[i] = x

A = A[A != 0]
A.sort()
A = A[::-1]

if len(A) > 0:
	red = np.bitwise_xor.reduce(A)
else:
    red = 0
blue = red^xor
answer = red + blue
print(answer)

Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline
sys.setrecursionlimit(10 ** 7)

import numpy as np

N = int(input())
A = np.array([int(x) for x in input().split()],dtype=np.int64)

"""
F_2 上の線形代数。基本変形で簡単な基底を得る。
"""

xor = np.bitwise_xor.reduce(A)

A = np.concatenate([np.array([1<<i for i in range(60) if xor&(1<<i)],np.int64),A])

for k in range(60,-1,-1):
    bit = 1<<k
    one = (A&bit != 0)
    i = np.where(one & (A < (1<<(k+1))))[0]
    if len(i) == 0:
        continue
    i = i[0]
    x = A[i]
    A[one] ^= x
    A[i] = x

A = A[A != 0]
A.sort()
A = A[::-1]

red = np.bitwise_xor.reduce(A)
blue = red^xor
answer = red + blue
print(answer)

Fixed submission:
import sys
input = sys.stdin.readline
sys.setrecursionlimit(10 ** 7)

import numpy as np

N = int(input())
A = np.array([int(x) for x in input().split()],dtype=np.int64)

"""
F_2 上の線形代数。基本変形で簡単な基底を得る。
"""

xor = np.bitwise_xor.reduce(A)

A = np.concatenate([np.array([1<<i for i in range(60) if xor&(1<<i)],np.int64),A])

for k in range(60,-1,-1):
    bit = 1<<k
    one = (A&bit != 0)
    i = np.where(one & (A < (1<<(k+1))))[0]
    if len(i) == 0:
        continue
    i = i[0]
    x = A[i]
    A[one] ^= x
    A[i] = x

A = A[A != 0]
A.sort()
A = A[::-1]

if len(A) > 0:
	red = np.bitwise_xor.reduce(A)
else:
    red = 0
blue = red^xor
answer = red + blue
print(answer)

Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline
sys.setrecursionlimit(10 ** 7)

import numpy as np

N = int(input())
A = np.array([int(x) for x in input().split()])

"""
F_2 上の線形代数。基本変形で簡単な基底を得る。
"""

xor = np.bitwise_xor.reduce(A)

A = np.concatenate([np.array([1<<i for i in range(60) if xor&(1<<i)],np.int64),A])

for k in range(60,-1,-1):
    bit = 1<<k
    one = (A&bit != 0)
    i = np.where(one & (A < (1<<(k+1))))[0]
    if len(i) == 0:
        continue
    i = i[0]
    x = A[i]
    A[one] ^= x
    A[i] = x

A = A[A != 0]
A.sort()
A = A[::-1]

red = np.bitwise_xor.reduce(A)
blue = red^xor
answer = red + blue
print(answer)

Fixed submission:
import sys
input = sys.stdin.readline
sys.setrecursionlimit(10 ** 7)

import numpy as np

N = int(input())
A = np.array([int(x) for x in input().split()],dtype=np.int64)

"""
F_2 上の線形代数。基本変形で簡単な基底を得る。
"""

xor = np.bitwise_xor.reduce(A)

A = np.concatenate([np.array([1<<i for i in range(60) if xor&(1<<i)],np.int64),A])

for k in range(60,-1,-1):
    bit = 1<<k
    one = (A&bit != 0)
    i = np.where(one & (A < (1<<(k+1))))[0]
    if len(i) == 0:
        continue
    i = i[0]
    x = A[i]
    A[one] ^= x
    A[i] = x

A = A[A != 0]
A.sort()
A = A[::-1]

if len(A) > 0:
	red = np.bitwise_xor.reduce(A)
else:
    red = 0
blue = red^xor
answer = red + blue
print(answer)