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21. 合并两个有序链表

宁静的猫 2022-02-25 阅读 57
leetcode
class Solution {
    public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
        //辅助节点
        ListNode dummy = new ListNode(-1);
        for(ListNode cur = dummy; l1!= null || l2!=null;) {
            if(l1 == null){
                cur.next = l2;
                return dummy.next;
            }
            if(l2 == null) {
                cur.next = l1;
                return dummy.next;
            }

            if(l1.val< l2.val) {
                cur.next = l1;
                l1 = l1.next;
            }else {
                cur.next = l2;
                l2 = l2.next;
            }
        
            cur = cur.next;
        }
        return dummy.next;
    }

    public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
        ListNode dummy = new ListNode(-1    );
        ListNode cur =dummy;
        while(l1!= null && l2!= null) {
            if(l1.val < l2.val) {
                cur.next = l1;
                l1 = l1.next;
            }else {
                cur.next =l2;
                l2 = l2.next;
            }
            cur= cur.next;
        }
        if(l1!= null) 
            cur.next = l1;
        if(l2 != null)
            cur.next = l2;
        return dummy.next;
    }
}
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