leetcode 002 Add Two Numbers(java)

leetcode 002 Add Two Numbers

Add Two Numbers

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Question

Total Accepted: 105768 Total Submissions: 494750 Difficulty: Medium

 
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

题意：用链表实现两个数的相加。
java 毫不熟悉呀 我要加油了，cxq!

public class Solution {
public static ListNode addTwoNumbers(ListNode l1, ListNode l2) {
ListNode l3 = new ListNode(-1);
ListNode l3head=l3;
if(l1==null)
return l2;
if(l2==null)
return l1;
int carry=0;

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

l3.next=new ListNode(carry%10);
carry=carry/10;
l3=l3.next;

}

if(carry==1){
l3.next=new ListNode(1);
}
return l3head.next;
}

public static void main(String[] args) {
ListNode l1=new ListNode(2);
l1.next=new ListNode(4);
l1.next.next=new ListNode(3);
ListNode l2=new ListNode(5);
l2.next=new ListNode(6);
l2.next.next=new ListNode(4);
ListNode anwer=addTwoNumbers(l1,l2);
System.out.println(anwer.val+" "+anwer.next.val+" "+anwer.next.next.val);

}
}