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5 changes: 5 additions & 0 deletions note/021/README.md
Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,11 @@ class Solution {
public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
ListNode head = new ListNode(0);
ListNode temp = head;
if (l1 == null) {
return l2;
} else if (l2 == null) {
return l1;
}
while (l1 != null && l2 != null) {
if (l1.val < l2.val) {
temp.next = l1;
Expand Down
7 changes: 6 additions & 1 deletion src/com/blankj/easy/_021/Solution.java
Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,11 @@ public class Solution {
public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
ListNode head = new ListNode(0);
ListNode temp = head;
if (l1 == null) {
return l2;
} else if (l2 == null) {
return l1;
}
while (l1 != null && l2 != null) {
if (l1.val < l2.val) {
temp.next = l1;
Expand All @@ -36,4 +41,4 @@ public static void main(String[] args) {
ListNode.print(listNode1);
ListNode.print(solution.mergeTwoLists(listNode0, listNode1));
}
}
}