Remove Linked List Elements

 https://leetcode.com/problems/remove-linked-list-elements/

class Solution {
public:
    ListNode* removeElements(ListNode* head, int val) {
        if(head==NULL ) return head;
        while(head!=NULL && head->val==val){
            head=head->next;
        }
       ListNode* prev=NULL;
       ListNode* temp=head;
        while(temp!=NULL && temp->next!=nullptr){
           
            if(temp->next->val==val)
                temp->next = temp->next->next;
           else temp=temp->next;
        }
       return head;
    }
};

 

class Solution {
public:
    ListNode* removeElements(ListNode* head, int val) {
        if(head==NULL ) return head;
        while(head!=NULL && head->val==val){
            head=head->next;
        }
       ListNode* prev=NULL;
       ListNode* temp=head;
        while(temp!=NULL ){
           if(temp->val==val){
               prev->next=temp->next;
               temp=temp->next;
           }
            else{
                prev=temp;
                temp=temp->next;
            }
           
        }
       return head;
    }
};