/
index.ts
45 lines (43 loc) · 1.09 KB
/
index.ts
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import { ListNode } from "../mod.ts";
export default function addTwoNumbers(
l1: ListNode | null,
l2: ListNode | null,
): ListNode | null {
if (!l1) {
return l2;
}
if (!l2) {
return l1;
}
const node_to_prev = new WeakMap<ListNode, ListNode | null>();
while (l1 && l1.next) {
node_to_prev.set(l1.next, l1);
l1 = l1.next;
}
// l1 = l1.next;
while (l2 && l2.next) {
node_to_prev.set(l2.next, l2);
l2 = l2.next;
}
// l2 = l2.next;
// console.log(l1,l2)
let head = null;
// let temp: ListNode | null = head;
let p1: ListNode | null | undefined = l1;
let p2: ListNode | null | undefined = l2;
let carry = 0;
while (p1 || p2 || carry) {
if (p1) {
carry += p1.val;
p1 = node_to_prev.get(p1);
}
if (p2) {
carry += p2.val;
p2 = node_to_prev.get(p2);
}
// temp.next = new ListNode(carry % 10);
head = new ListNode(carry % 10, head);
carry = Math.floor(carry / 10);
}
return head;
}