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  • Add Two Numbers LeetCode Java

    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

    /**
     * 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) {
            int carry = 0;
            ListNode newHead = new ListNode(0);
            ListNode p1 = l1, p2 = l2, p3=newHead;
            
            while(p1 != null || p2 != null){
                if(p1 != null){
                    carry += p1.val;
                    p1 = p1.next;
                }
                
                if(p2 != null){
                    carry += p2.val;
                    p2 = p2.next;
                }
                
                p3.next = new ListNode(carry%10);
                p3 = p3.next;
                
                carry /= 10;
            }
            
            if(carry == 1){
                p3.next = new ListNode(1);
            }
            return newHead.next;
            
        }
    }
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  • 原文地址:https://www.cnblogs.com/iwangzheng/p/6001754.html
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