83. 删除排序链表中的重复元素

83. 删除排序链表中的重复元素

1:37:19

/**
 * @param {ListNode} head
 * @return {ListNode}
 */
var deleteDuplicates = function(head) {
    if(!head) return null;
    let pre=head,cur=head.next;
    while(cur){
        if(cur.val!=pre.val){
            pre.next=cur;
            pre=cur
            cur=cur.next;               
        }else{
            cur=cur.next;
        }
    }
    pre.next=null;
    return head;
};

/**
 * Definition for singly-linked list.
 * function ListNode(val, next) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.next = (next===undefined ? null : next)
 * }
 */
/**
 * @param {ListNode} head
 * @return {ListNode}
 */
var deleteDuplicates = function(head) {
    let cur=head;
    while(cur&&cur.next){
        if(cur.val==cur.next.val){
            cur.next=cur.next.next
        }else{
            cur=cur.next
        }
    }
    return head
};