206. Reverse Linked List.cpp

class Solution {
public:
    ListNode* reverseList(ListNode* head) {
     ListNode* t1 = NULL;
     ListNode* t2 = NULL;
    
        while(head!=NULL){
            t2 = head->next;
            head->next = t1;
            t1 = head;
            head = t2;
        }
        return t1;
    }
};