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LeetCode_00021.java
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39 lines (36 loc) · 1.01 KB
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package com.github.jerring.leetcode;
public class LeetCode_00021 {
public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
ListNode dummy = new ListNode(-1);
ListNode node = dummy;
while (l1 != null && l2 != null) {
if (l1.val < l2.val) {
node.next = l1;
l1 = l1.next;
} else {
node.next = l2;
l2 = l2.next;
}
node = node.next;
}
if (l1 != null) {
node.next = l1;
}
if (l2 != null) {
node.next = l2;
}
return dummy.next;
}
// 递归写法
// public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
// if (l1 == null) return l2;
// if (l2 == null) return l1;
// if (l1.val < l2.val) {
// l1.next = mergeTwoLists(l1.next, l2);
// return l1;
// } else {
// l2.next = mergeTwoLists(l1, l2.next);
// return l2;
// }
// }
}