4 test case failing

What’s the Issue with my code

n=int(input())
li=[int(ele) for ele in input().strip().split()]
def next_index(li,i):
    return (i+li[i]+len(li))%len(li)
def circular_check(li):
    for i in range(len(li)):
        slow=i
        fast=i
        if li[i]==0:
            continue
        while (li[slow]*li[next_index(li,slow)]>0) and (li[fast]*li[next_index(li,fast)]>0) and (li[fast]*li[next_index(li,next_index(li,fast))]>0):
            slow=next_index(li,slow)
            fast=next_index(li,next_index(li,fast))
            if slow==fast:
                if slow==next_index(li,slow):
                    break
                return True
        slow=i
        val=li[slow]
        while (val*li[slow]>0):
            x=slow
            slow=next_index(li,slow)
            li[x]=0
    return False

if circular_check(li):
    print(1)
else:
    print(0)

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where ?
i can’t find that

Check chat, you will see my message.

no message in my chat
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I did replied @ritvikagrawal1

Hello @ritvikagrawal1, don’t worry I will help you out. First of all, pls let me know the ques. Which ques is this ??