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21. Merge Two Sorted Lists

时间:2015-05-13 08:42:20      阅读:97      评论:0      收藏:0      [点我收藏+]

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Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.

经典实现题。

/**
* Definition for singly-linked list.
* public class ListNode {
*    int val;
*    ListNode next;
*    ListNode(int x) { val = x; }
* }
*/
public class Solution {
  public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
    ListNode head = new ListNode(0);
    ListNode tmp = head;
    while (l1 != null && l2 != null) {
      if (l1.val < l2.val) {
        tmp.next = l1;
        l1 = l1.next;
      } else {
        tmp.next = l2;
        l2 = l2.next;
      }
      tmp = tmp.next;
    }
    if (l1 != null) {
      tmp.next = l1;
    } else {
      tmp.next = l2;
    }
    return head.next;
  }
}

21. Merge Two Sorted Lists

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原文地址:http://www.cnblogs.com/shini/p/4499294.html

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