力扣 21. 合并两个有序链表 JavaScript

短命女 2022-11-07 14:50 93阅读 0赞

代码如下

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//Definition for singly-linked list.
    function ListNode(val, next) {
        
        this.val = (val === undefined ? 0 : val)
        this.next = (next === undefined ? null : next)
    }
    
    /**
     * @param {ListNode} l1
     * @param {ListNode} l2
     * @return {ListNode}
     */
    var mergeTwoLists = function (l1, l2) {
        
        // 分别两个指针指向两个链表头部
        let pl1 = l1;
        let pl2 = l2;
    
        let head = new ListNode;
        let pHead = head; // result指针
    
        while (pl1 || pl2) {
         
            while (pl1 && pl2) {
        
                if (pl1.val < pl2.val) {
        
                    pHead.next = new ListNode(pl1.val, null);
                    pl1 = pl1.next;
                } else {
        
                    pHead.next = new ListNode(pl2.val, null);
                    pl2 = pl2.next;
                }
                pHead = pHead.next;
            }
    
            while (pl1) {
        
                pHead.next = new ListNode(pl1.val, null);
                pHead = pHead.next;
                pl1 = pl1.next;
            }
    
            while (pl2) {
        
                pHead.next = new ListNode(pl2.val, null);
                pHead = pHead.next;
                pl2 = pl2.next;
            }
        }
    
        return head.next;
    };
    
    let l1 = new ListNode(1, new ListNode(2, null));
    let l2 = new ListNode(2, null);
    
    console.log(mergeTwoLists(l1, l2));
    
    /**
     ListNode {
      val: 1,
      next: ListNode { val: 2, next: ListNode { val: 2, next: null } }
    }
     */

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[https://github.com/lesliefish/leetcode-js][https_github.com_lesliefish_leetcode-js]

[https_github.com_lesliefish_leetcode-js]: https://github.com/lesliefish/leetcode-js