LeetCode题解 —— 2. Add Two Numbers
2018-02-22 06:28
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题目内容:
Difficulty: Medium Total Accepted: 442.7K Total Submissions: 1.6MYou are given two non-empty linked lists representing two non-negative integers. 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.
You may assume the two numbers do not contain any leading zero, except the number 0 itself.
Example
Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8
Explanation: 342 + 465 = 807.
题目描述
读完题目和给出的例子,我们发现本题是将数字用链表进行倒序存储,342用链表存储表示为2 -> 4 -> 3,同样两个数加和的结果也是这样存储,这就有一个需要注意的地方,两个加数每位上的数字加和逢十进一的时候,结果链表中倒序存储,所以进位是向后的。解题思路及代码实现(java)
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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