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标题: leetcode真题-链表求解两数和 [打印本页]

作者: 一秉 时间: 2020-7-31 23:49
标题: leetcode真题-链表求解两数和
给定两个代表非负数的链表，数字在链表中是反向存储的（链表头结点处的数字是个位数，第二个结点上的数字是十位数...），求这个两个数的和，结果也用链表表示。
输入：(2 -> 4 -> 3) + (5 -> 6 -> 4)
输出： 7 -> 0 -> 8

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
public class Solution {
public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
      if(l1==null)
         return l2;
      if(l2==null)
         return l1;
      ListNode head = new ListNode(0);
      ListNode p = head;

      int temp = 0;
      while(l1!=null||l2!=null||temp!=0){
         if(l1!=null){
            temp+=l1.val;
            l1=l1.next;
         }
         if(l2!=null){
            temp+=l2.val;
            l2=l2.next;
         }

         p.next=new ListNode(temp%10);
         p=p.next;
         temp/=10;
      }
      return head.next;
}
}

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