delete_duplicate_from_linked_list.cpp

//program for delete duplicate from linked list
//problem link:https://leetcode.com/problems/remove-duplicates-from-sorted-list/

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode() : val(0), next(nullptr) {}
 *     ListNode(int x) : val(x), next(nullptr) {}
 *     ListNode(int x, ListNode *next) : val(x), next(next) {}
 * };
 */
class Solution {
public:
    ListNode* deleteDuplicates(ListNode* head) {
        if(head==NULL)
        {
            return head;
        }

        ListNode*tmp=head;
        while(tmp->next!=NULL)
        {
            if(tmp->val==tmp->next->val)
            {
                ListNode*deleteNode=tmp->next;
                tmp->next=tmp->next->next;
                delete deleteNode;
                if(tmp->next==NULL)
                {
                    break;
                }
    
            }
            if(tmp->val!=tmp->next->val)
            {
                tmp=tmp->next;
            }
        }
        return head;
    }
};