Cycle Detection

 https://www.hackerrank.com/challenges/detect-whether-a-linked-list-contains-a-cycle/problem

 

bool has_cycle(SinglyLinkedListNode* head) {

SinglyLinkedListNode* slow=head;
SinglyLinkedListNode* fast=head;

while(slow && fast && fast->next){
    slow=slow->next;
    fast=fast->next->next;
    if(fast==slow){
        return 1;
    }
}
return 0;
}

 

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