JS_LeetCode 02_两数相加
样例
输入:(2 -> 4 -> 3) + (5 -> 6 -> 4)
输出:7 -> 0 -> 8
原因:342 + 465 = 807
模拟题:
每个节点相加即可,但是需要进位,本题按照逆序来输出的
/**
* 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}
*/
var addTwoNumbers = function(l1, l2) {
//逆序输出,直接冲头节点开始即可
let sum = 0;
let cnt = 0;
let head = new ListNode('head');
let p = head;
while(l1 || l2){
let ans = (l1 ? l1.val : 0) + (l2 ? l2.val : 0) + cnt;
cnt = ans >= 10 ? 1 : 0;
p.next = new ListNode(ans%10);
p = p.next;
l1 && (l1 = l1.next);
l2 && (l2 = l2.next);
}
cnt && (p.next = new ListNode(cnt));
return head.next;
};