Buggy python submission (verdict: Time Limit Exceeded):
def kosu(kitei, aaa):
    ret = 0
    n=len(kitei)
    for i in range(n):
        if kitei[i]:
            ret += 1
            x = 0
            while (2**(x+1)) <= kitei[i]:
                x += 1
            for y in range(i+1, n, 1):
                if kitei[y] & (2 ** x):
                    kitei[y] ^= kitei[i]
    
    ret2=0
    kitei.append(aaa)
    n+=1
    for i in range(n):
        if kitei[i]:
            ret2 += 1
            x = 0
            while (2**(x+1)) <= kitei[i]:
                x += 1
            for y in range(i+1, n, 1):
                if kitei[y] & (2 ** x):
                    kitei[y] ^= kitei[i]
    
    if ret==ret2:
        return 1
    else:
        return 0


def solve(n, alist, s):
    kitei=[0]
    answer=0
    for i in range(n):
        teban=s[n-i-1]
        now=alist[n-i-1]
        if teban=='0':
            if kosu(kitei, now)>0:
                pass
            else:
                kitei.append(now)
        else:
            if kosu(kitei, now)>0:
                pass
            else:
                answer=1
        #print(kitei)
    return answer


t=int(input())
for i in range(t):
    n=int(input())
    alist = list(map(int, input().split()))
    s=input()
    print(solve(n, alist, s))

Fixed submission:
def kosu(kitei, aaa, tuika):
    global now_ret
    ret = 0
    n=len(kitei)
    ret2=0
    kitei.append(aaa)
    n+=1
    for i in range(n):
        if kitei[i]:
            ret2 += 1
            x = 0
            while (2**(x+1)) <= kitei[i]:
                x += 1
            for y in range(i+1, n, 1):
                if kitei[y] & (2 ** x):
                    kitei[y] ^= kitei[i]
    
    if now_ret==ret2:
        return 1
    else:
        if tuika==1:
            now_ret+=1
        return 0
 
 
def solve(n, alist, s):
    kitei=[0]
    answer=0
    for i in range(n):
        teban=s[n-i-1]
        now=alist[n-i-1]
        if teban=='0':
            if kosu(kitei, now, 1)>0:
                pass
            else:
                kitei.append(now)
        else:
            if kosu(kitei, now, 0)>0:
                pass
            else:
                answer=1
        #print(kitei)
    return answer
 
t=int(input())
for i in range(t):
    now_ret=0
    n=int(input())
    alist = list(map(int, input().split()))
    s=input()
    print(solve(n, alist, s))

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

def kosu(kitei, k):
    n=len(kitei)
    lim = [0]*n
    for i in range(1, n):
        lim[i] = lim[i-1]|kitei[i-1]
    dp = [0]*(2**17)
    tmp = dp[:]
    dp[k] = 1
    for i in range(len(kitei))[::-1]:
        for j in range(lim[i]+1):
            tmp[j] = (dp[j^kitei[i]] + dp[j]) % (10**9+7)
        dp, tmp = tmp, dp
    return dp[0]
    
def solve(n, alist, s):
    kitei=[0]
    answer=0
    for i in range(n):
        teban=s[n-i-1]
        now=alist[n-i-1]
        if teban=='0':
            if kosu(kitei, now)>0:
                pass
            else:
                kitei.append(now)
        else:
            if kosu(kitei, now)>0:
                pass
            else:
                answer=1
    return answer

t=int(input())
for i in range(t):
    n=int(input())
    alist = list(map(int, input().split()))
    s=input()
    print(solve(n, alist, s))

Fixed submission:
def kosu(kitei, aaa, tuika):
    global now_ret
    ret = 0
    n=len(kitei)
    ret2=0
    kitei.append(aaa)
    n+=1
    for i in range(n):
        if kitei[i]:
            ret2 += 1
            x = 0
            while (2**(x+1)) <= kitei[i]:
                x += 1
            for y in range(i+1, n, 1):
                if kitei[y] & (2 ** x):
                    kitei[y] ^= kitei[i]
    
    if now_ret==ret2:
        return 1
    else:
        if tuika==1:
            now_ret+=1
        return 0
 
 
def solve(n, alist, s):
    kitei=[0]
    answer=0
    for i in range(n):
        teban=s[n-i-1]
        now=alist[n-i-1]
        if teban=='0':
            if kosu(kitei, now, 1)>0:
                pass
            else:
                kitei.append(now)
        else:
            if kosu(kitei, now, 0)>0:
                pass
            else:
                answer=1
        #print(kitei)
    return answer
 
t=int(input())
for i in range(t):
    now_ret=0
    n=int(input())
    alist = list(map(int, input().split()))
    s=input()
    print(solve(n, alist, s))

Buggy python submission (verdict: Time Limit Exceeded):
def solve(n, alist, s):
    senkei=[0]
    answer=0
    for i in range(n):
        teban=s[n-i-1]
        now=alist[n-i-1]
        if teban=='0':
            if now in senkei:
                pass
            else:
                new=[]
                for sn in senkei:
                    new.append(sn^now)
                senkei+=new
        else:
            if now in senkei:
                pass
            else:
                answer=1
    return answer

t=int(input())
for i in range(t):
    n=int(input())
    alist = list(map(int, input().split()))
    s=input()
    print(solve(n, alist, s))

Fixed submission:
def kosu(kitei, aaa, tuika):
    global now_ret
    ret = 0
    n=len(kitei)
    ret2=0
    kitei.append(aaa)
    n+=1
    for i in range(n):
        if kitei[i]:
            ret2 += 1
            x = 0
            while (2**(x+1)) <= kitei[i]:
                x += 1
            for y in range(i+1, n, 1):
                if kitei[y] & (2 ** x):
                    kitei[y] ^= kitei[i]
    
    if now_ret==ret2:
        return 1
    else:
        if tuika==1:
            now_ret+=1
        return 0
 
 
def solve(n, alist, s):
    kitei=[0]
    answer=0
    for i in range(n):
        teban=s[n-i-1]
        now=alist[n-i-1]
        if teban=='0':
            if kosu(kitei, now, 1)>0:
                pass
            else:
                kitei.append(now)
        else:
            if kosu(kitei, now, 0)>0:
                pass
            else:
                answer=1
        #print(kitei)
    return answer
 
t=int(input())
for i in range(t):
    now_ret=0
    n=int(input())
    alist = list(map(int, input().split()))
    s=input()
    print(solve(n, alist, s))