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