struct ListNode* removeElements(struct ListNode* head, int val){
if (head == NULL) {
return NULL;
}
head->next = removeElements(head->next, val);
return head->val == val ? head->next : head;
}
struct ListNode* removeElements(struct ListNode* head, int val){
if (head == NULL) {
return NULL;
}
head->next = removeElements(head->next, val);
return head->val == val ? head->next : head;
}