LeetCode -- Merge Two sorted lists

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/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     public int val;
 *     public ListNode next;
 *     public ListNode(int x) { val = x; }
 * }
 */
public class Solution {
    public ListNode MergeTwoLists(ListNode l1, ListNode l2) {
    	if(l1 == null){
		return l2;
	}
	if(l2 == null){
		return l1;
	}
	
	// merge l2 into l1
	ListNode head = l1;
	while(l2 != null){
		if(l1.next != null){
			if(l2.val >= l1.val && l2.val <= l1.next.val){
				var t = Remove(ref l2);
				t.next = l1.next;
				l1.next = t;
			}
			else if(l2.val < l1.val){
				var t = Remove(ref l2);
				t.next = l1;
				
				head = t;
				l1 = t;
			}
			else{
				l1 = l1.next;
			}
		}
		else{
			if(l1.val < l2.val){
				l1.next = Remove(ref l2);
			}
			else{
				var t = Remove(ref l2);
				t.next = l1;
				
				head = t;
				l1 = t;
			}
		}
		
	}
	
	return head;
    }
    
    private ListNode Remove(ref ListNode n)
    {
        
    	ListNode t = new ListNode(n.val);
    	if(n.next == null){
    		n = null;
    	}
    	else{
    		n.val = n.next.val;
    		n.next = n.next.next;
    	}
    	return t;
    }


}

LeetCode -- Merge Two sorted lists

标签：

原文地址：http://blog.csdn.net/lan_liang/article/details/48261603