Add Two Numbers

来源：互联网发布：金融数据分析师工资编辑：程序博客网时间：2024/05/16 11:41
/** * Definition for singly-linked list. * public class ListNode { *     int val; *     ListNode next; *     ListNode(int x) { val = x; } * } */public class Solution {    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {        if (l1 == null && l2 == null) {            return null;        }        if (l1 == null) {            return l2;        } else if (l2 == null) {            return l1;        }        int carry = 0;        ListNode dummy = new ListNode(-1);        //dummy.next = null;        ListNode ptr = dummy;        while (l1 != null && l2 != null) {            int val = (l1.val + l2.val + carry) % 10;            carry = (l1.val + l2.val + carry) / 10;            l1 = l1.next;            l2 = l2.next;            ListNode node = new ListNode(val);            ptr.next = node;            ptr = node;        }        if (l1 == null) {            while (l2 != null) {                int val = (l2.val + carry) % 10;                carry = (l2.val + carry) / 10;                ptr.next = new ListNode(val);                ptr = ptr.next;                l2 = l2.next;            }        } else {            while (l1 != null) {                int val = (l1.val + carry) % 10;                carry = (l1.val + carry) / 10;                ptr.next = new ListNode(val);                ptr = ptr.next;                l1 = l1.next;            }        }        if (carry != 0) {            ptr.next = new ListNode(carry);            ptr = ptr.next;        }        ptr.next = null;        return dummy.next;    }}
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