**Description**Hints**Submissions**Solutions
Total Accepted: 221656
Total Submissions: 571422
Difficulty: Easy
Contributor: LeetCode
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.
Hide Company Tags
Amazon LinkedIn Apple Microsoft
Hide Tags
Linked List
Hide Similar Problems
(H) Merge k Sorted Lists (E) Merge Sorted Array (M) Sort List (M) Shortest Word Distance II
** 解題思路**
recursive 遞歸解法仰税。 類似merge two sorted array
/**
* 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) {
// use recursive
if (l2 == null) return l1;
if (l1 == null) return l2;
ListNode mergeHead;
if (l1.val < l2.val) {
mergeHead = l1;
mergeHead.next = mergeTwoLists(l1.next, l2);
} else {
mergeHead = l2;
mergeHead.next = mergeTwoLists(l1, l2.next);
}
return mergeHead;
}
public ListNode mergeTwoListsFailed(ListNode l1, ListNode l2) {
ListNode p1 = l1;
ListNode p2 = l2 ;
ListNode p = new ListNode(0);
while (p1 != null && p2 != null) {
// p.next = (p1.val > p2.val) ? new ListNode(p1.val) : new ListNode(p2.val);
if (p1.val > p2.val) {
p.next = new ListNode(p1.val);
p1 = p1.next;
} else {
p.next = new ListNode(p2.val);
p2 = p2.next;
}
}
while (p2 != null) {
p.next = new ListNode(p2.val);
p2 = p2.next;
}
while (p1 != null) {
p.next = new ListNode(p1.val);
p1 = p1.next;
}
return p;
}
}
