2. Add Two Numbers

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C++ | Basic Approach | 100% success 


class Solution {

public:

    ListNode* addTwoNumbers(ListNode *l1, ListNode *l2) {

        ListNode *cur1{l1};

        ListNode *cur2{l2};

        ListNode *start = new ListNode(0);

        ListNode *prev = start;

        int carry = 0;

        while (cur1 || cur2 || carry) {

            int sum = (cur1 ? cur1->val : 0) + (cur2 ? cur2->val : 0) + carry;

            carry = 0;

            if (sum > 9) {

                sum -= 10;

                carry = 1;

            }

            ListNode *new_node = new ListNode(sum);

            prev->next = new_node;

            prev = new_node;


            cur1 = cur1 ? cur1->next : cur1;

            cur2 = cur2 ? cur2->next : cur2;

        }

        return start->next;

    }


};

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