Not able to pass two test cases

#1

question : https://hack.codingblocks.com/app/practice/1/4/problem
answer: https://hack.codingblocks.com/app/practice/1/4/problem

#2

please share code in cb ide
instead of code u have provide q link twice

#3 
   ListNode* middleNode(ListNode* head) {
        ListNode *s = head, *f = head; 
        while(f!= NULL and f->next!= NULL){
            s = s->next;
            f = f->next->next;
            
        }
        return s;
    }
#4

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