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jam 블로그
#2. Add Two Numbers [Medium][Javascript] 본문
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문제
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 contains a single digit. Add the two numbers and return the sum as a linked list.
You may assume the two numbers do not contain any leading zero, except the number 0 itself.
Example 1:
Input: l1 = [2,4,3], l2 = [5,6,4]
Output: [7,0,8]
Explanation: 342 + 465 = 807.
Example 2:
Input: l1 = [0], l2 = [0]
Output: [0]
Example 3:
Input: l1 = [9,9,9,9,9,9,9], l2 = [9,9,9,9]
Output: [8,9,9,9,0,0,0,1]
Constraints:
- The number of nodes in each linked list is in the range
[1, 100]
. 0 <= Node.val <= 9
- It is guaranteed that the list represents a number that does not have leading zeros.
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var addTwoNumbers = function(l1, l2) {
let upNumber = 0;
const head = new ListNode(0, null);
let pr = head;
while(l1 !== null || l2 !== null) {
const sum = (l1 ? l1.val : 0) + (l2 ? l2.val: 0);
const current = new ListNode((sum + upNumber) % 10, null);
upNumber = Math.floor((sum + upNumber) / 10);
l1 = l1 ? l1.next : null;
l2 = l2 ? l2.next : null;
pr.next = current;
pr = pr.next;
}
if(upNumber > 0) {
pr.next = new ListNode(upNumber, null)
}
return head.next;
};
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