LeetCode 2 - Add Two Numbers

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Add Two Numbers

You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8

My Code

/** * Definition for singly-linked list. * struct ListNode { *     int val; *     ListNode *next; *     ListNode(int x) : val(x), next(NULL) {} * }; */class Solution {public:    ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) {        long long number1 = 0, number2 = 0;        int i = 0;        while (l1 != NULL)        {            number1 += pow(10, i) * l1->val;            l1 = l1->next;            i++;        }        i = 0;        while (l2 != NULL)        {            number2 += pow(10, i) * l2->val;            l2 = l2->next;            i++;        }        long long result = number1 + number2;                ListNode* resultList = new ListNode(result%10);        result /= 10;        ListNode* resultListIter = resultList;        while (result != 0)        {            resultListIter->next = new ListNode(result%10);            result /= 10;            resultListIter = resultListIter->next;        }        return resultList;    }};

Runtime: 40 ms

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