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21.java
36 lines (36 loc) · 890 Bytes
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21.java
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/**
* 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) {
if (l1 == null ) return l2;
if (l2 == null ) return l1;
ListNode head, p;
if ( l1.val < l2.val) {
head = l1;
l1 = l1.next;
} else {
head = l2;
l2 = l2.next;
}
p = head;
while(l1!= null && l2 != null) {
if (l1.val < l2.val) {
p.next = l1;
l1 = l1.next;
} else {
p.next = l2;
l2 = l2.next;
}
p = p.next;
}
if (l1 == null ) p.next = l2;
if (l2 == null ) p.next = l1;
return head;
}
}