问除非添加了cout语句，否则代码将获得SIGSEGV，然后给出正确的结果

EN

void removeLoop(Node* head)
{
    Node *slow=head,*fast=head;
    int u=0;
    while(slow !=NULL and fast->next!=NULL and fast!=NULL){
        slow=slow->next;
        fast=fast->next->next;
        if(slow==fast){
            u=1;
            break;
        }
    }
    if(u==1){
        int k=1;
        while(fast->next!=slow){
            fast=fast->next;
            k++;
        }
        slow=head;
        fast=head;
        for(int i=0;i<k;i++){
            fast=fast->next;
        }
        while(slow!=fast){
            slow=slow->next;
            fast=fast->next;
        }
        while(fast->next!=slow){
            fast=fast->next;
        }
        //cout<<fast->next->data<<endl;
        fast->next=NULL;
     }
}