Detect loop in a linked list(GFG).cpp

class Solution
{
    public:
    //Function to check if the linked list has a loop.
    bool detectLoop(Node* head)
    {
        
        Node* fast = head;
        Node* slow = head;
        while(fast != NULL && fast-> next != NULL){
            fast = fast->next->next;
            slow = slow->next;
            
            if(fast == slow){
            return true;
        
            }
        }
        return false;
        
    }
};