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2. 两数相加-MEDIUM.js
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2. 两数相加-MEDIUM.js
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// https://leetcode.cn/problems/add-two-numbers/
/**
* Definition for singly-linked list.
* function ListNode(val, next) {
* this.val = (val===undefined ? 0 : val)
* this.next = (next===undefined ? null : next)
* }
*/
/**
* @param {ListNode} l1
* @param {ListNode} l2
* @return {ListNode}
*/
function ListNode(val, next) {
this.val = val === undefined ? 0 : val;
this.next = next === undefined ? null : next;
}
/**
* 链表l1 l2是逆序存储的 所以我们只要同为相加就可以了
* 当长度不一时 缺少的位置直接0代替
*
*/
var addTwoNumbers = function (l1, l2) {
let resList = new ListNode();
let tempList = resList;
let carry = 0;
while (l1 || l2 || carry) {
let sum = (l1?.val || 0) + (l2?.val || 0) + carry;
tempList.next = new ListNode(sum % 10);
tempList = tempList.next;
carry = (sum / 10) | 0;
l1 = l1?.next;
l2 = l2?.next;
}
return resList.next;
};