Remove loop in linked list

class Solution:
    def removeLoop(self, head):
        def remove(x):
            if x==head:
                t=head
                while t.next!=head:t=t.next
                t.next=None
            else:
                t=head
                while t.next!=x.next:
                    t,x=t.next,x.next
                x.next=None

        s=f=head
        while f.next and f.next.next:
            s,f=s.next,f.next.next
            if s==f:
                remove(s)
                return
        return



#{
#  Driver Code Starts
# driver code:

class Node:
    def __init__(self,val):
        self.next=None
        self.data=val

class linkedList:
    def __init__(self):
        self.head=None
        self.tail=None

    def add(self,num):
        if self.head is None:
            self.head=Node(num)
            self.tail=self.head
        else:
            self.tail.next=Node(num)
            self.tail=self.tail.next

    def isLoop(self):
        if self.head is None:
            return False

        fast=self.head.next
        slow=self.head

        while slow != fast:
            if fast is None or fast.next is None:
                return False
            fast=fast.next.next
            slow=slow.next

        return True

    def loopHere(self,position):
        if position==0:
            return

        walk=self.head
        for _ in range(1,position):
            walk=walk.next
        self.tail.next=walk

    def length(self):
        walk=self.head
        ret=0
        while walk:
            ret+=1
            walk=walk.next
        return ret

if __name__=="__main__":
    t=int(input())
    for _ in range(t):
        n=int(input())
        arr=tuple(int(x) for x in input().split())
        pos=int(input())

        ll = linkedList()
        for i in arr:
            ll.add(i)
        ll.loopHere(pos)

        Solution().removeLoop(ll.head)

        if ll.isLoop() or ll.length()!=n:
            print(0)
            continue
        else:
            print(1)

# } Driver Code Ends