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| class Solution {
public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
if (l1 == null) {
return l2;
} else if (l2 == null) {
return l1;
}
ListNode ans = new ListNode(0);
var p = ans;
var p1 = l1;
var p2 = l2;
while (p1 != null && p2 != null) {
if (p1.val <= p2.val) {
var tmp = p1;
p1 = p1.next;
tmp.next = null;
p.next = tmp;
p = p.next;
} else {
var tmp = p2;
p2 = p2.next;
tmp.next = null;
p.next = tmp;
p = p.next;
}
}
if (p1 != null) {
p.next = p1;
} else {
p.next = p2;
}
return ans.next;
}
}
|
