从列表移除第N个元素

/**
 * Definition for singly-linked list.
 * function ListNode(val, next) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.next = (next===undefined ? null : next)
 * }
 */
/**
 * @param {ListNode} head
 * @param {number} n
 * @return {ListNode}
 */
var removeNthFromEnd = function(head, n) {
    let count=0;
    let tmp=head;
    
    while(count<n){
        tmp=tmp.next
        count++
    }
    if(!tmp||!tmp.next)return head.next
    tmp.next=(tmp.next).next;
    
    console.log(head)
    
    
    return head
};