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Copy pathAdd_Two_Numbers.js
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47 lines (44 loc) · 1.11 KB
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/**
* 2. Add Two Numbers
*
* Tags: Linked List、Math
*
* https://leetcode.com/problems/add-two-numbers/description/
*/
function ListNode(val) {
this.val = val;
this.next = null;
};
// 104ms, O(Max(N, M))
var addTwoNumbers = function(l1, l2) {
let head = null;
if (l1 !== null && l2 !== null) {
let n1 = l1;
let n2 = l2;
let tail = null;
let addOne = false;
let sum = 0;
while (n1 !== null || n2 !== null) {
if (n1 !== null && n2 !== null) {
sum = n1.val + n2.val + addOne;
} else {
sum = (n1 ? n1.val : n2.val) + addOne;
}
addOne = sum > 9;
sum %= 10;
n1 = n1 ? n1.next : null;
n2 = n2 ? n2.next : null;
if (head === null) {
head = new ListNode(sum);
tail = head;
} else {
tail.next = new ListNode(sum);
tail = tail.next;
}
}
if (addOne) {
tail.next = new ListNode(1);
}
}
return head;
};