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77 lines
1.1 KiB
77 lines
1.1 KiB
/**
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* Definition for singly-linked list.
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* function ListNode(val) {
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* this.val = val;
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* this.next = null;
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* }
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*/
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/**
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* @param {ListNode} l1
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* @param {ListNode} l2
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* @return {ListNode}
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*/
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var addTwoNumbers = function(l1, l2) {
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var carry = 0;
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var sum;
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var startNode = null;
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var prevNode = null;
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var node = null;
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while(true){
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if (l1 !== null){
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if (l2 !== null){
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sum = l1.val + l2.val + carry;
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} else {
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sum = l1.val + carry;
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}
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} else {
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if (l2 === null){
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break;
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} else {
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sum = l2.val + carry;
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}
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}
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if (sum >= 10){
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sum = sum - 10;
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carry = 1;
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} else {
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carry = 0;
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}
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node = {
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val: sum,
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next: null
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}
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if (prevNode !== null){
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prevNode.next = node;
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}
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if (startNode === null){
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startNode = node;
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}
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prevNode = node;
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if (l1 !== null){
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l1 = l1.next;
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}
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if (l2 !== null){
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l2 = l2.next;
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}
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}
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if (carry === 1){
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node = {
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val: 1,
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next: null
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}
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prevNode.next = node;
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}
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return startNode;
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};
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