題目

https://leetcode.com/problems/sum-of-two-integers/

題解

需要注意 當兩個鏈表不一樣長時 的收尾處理。

/*** Definition for singly-linked list.* public class ListNode {* int val;* ListNode next;* ListNode() {}* ListNode(int val) { this.val = val; }* ListNode(int val, ListNode next) { this.val = val; this.next = next; }* }*/ class Solution {public ListNode addTwoNumbers(ListNode l1, ListNode l2) {ListNode head = new ListNode();ListNode pre = head;short carry = 0;while (l1 != null || l2 != null) {ListNode node;int a1 = 0;int a2 = 0;if (l1 != null) {a1 = l1.val;l1 = l1.next;}if (l2 != null) {a2 = l2.val;l2 = l2.next;}int sum = a1 + a2 + carry;if (sum >= 10) {node = new ListNode(sum % 10);carry = 1;} else {node = new ListNode(sum);carry = 0;}pre.next = node;pre = node;}if (carry == 1) {pre.next = new ListNode(1);}return head.next;} }

總結

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