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23.java
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72 lines (41 loc) · 944 Bytes
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class Solution {
public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
if(l1==null)
{
return l2;
}
if(l2==null)
{
return l1;
}
ListNode head = new ListNode(0);
ListNode result = head;
while(l1!=null&&l2!=null)
{
if(l1.val<=l2.val)
{
result.val = l1.val;
l1 = l1.next;
}
else
{
result.val = l2.val;
l2 = l2.next;
}
ListNode p = new ListNode(0);
result.next = p;
result = p;
}
if(l1!=null)
{
result.val = l1.val;
result.next = l1.next;
}
if(l2!=null)
{
result.val = l2.val;
result.next = l2.next;
}
return head;
}
}