leetcode之Add Two Numbers

Add Two Numbers

AC Rate: 1710/7566

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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

此题很简单，不多说。

下面是我的代码：

public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
		ListNode node=null;
		node=buildList(l1, l2, node);
		return node;
	}
	
	public ListNode buildList(ListNode l1, ListNode l2,ListNode node){
		int addDigit=0,v1,v2;
		ListNode tmp=node;
		while(!(l1==null&&l2==null)){
			if(l1!=null)
				v1=l1.val;
			else
				v1=0;
			if(l2!=null)
				v2=l2.val;
			else 
				v2=0;
			int value=v1+v2+addDigit;
			int digit=value%10;
			int add=value/10;
			ListNode newNode=new ListNode(digit);
			addDigit=add;
			if(tmp==null){
				tmp=newNode;
				node=tmp;
			}
			else{
				tmp.next=newNode;
				tmp=tmp.next;
			}
			if(l1!=null)
				l1=l1.next;
			if(l2!=null)
				l2=l2.next;
		}
		ListNode tmp2=node;
		if(addDigit!=0){
			while(tmp2.next!=null)
				tmp2=tmp2.next;
			tmp2.next=new ListNode(addDigit);
		}
		return node;
	}