【Leetcode】2. Add Two Numbers

時間 2019-11-26

標籤 Leetcode add numbers 简体版

原文原文鏈接

1.英文題目java

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.node

You may assume the two numbers do not contain any leading zero, except the number 0 itself.git

Example:code

Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8
Explanation: 342 + 465 = 807.

2.解題get

public static ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        List<ListNode> listNodeList = new ArrayList<>();
        int nextValue = 0;
        //兩個連接相加遍歷過程，只有兩個鏈表都已經遍歷完了並且最後一位相加不大於10
        for (; l1 != null || l2 != null || nextValue != 0; ) {
            int value1 = l1 == null ? 0 : l1.val;
            int value2 = l2 == null ? 0 : l2.val;
            listNodeList.add(new ListNode((value1 + value2 + nextValue) % 10));
            nextValue = (value1 + value2 + nextValue) / 10;
            l1 = (l1 == null) ? null : l1.next;
            l2 = (l2 == null) ? null : l2.next;
        }
        //給鏈表增長連接
        for (int i = 0; i < listNodeList.size() - 1; i++) {
            listNodeList.get(i).next = listNodeList.get(i + 1);
        }
        return listNodeList.get(0);
    }

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