Add Two Numbers
给两个list, 返回一个list是这两个list的合.
/**
* 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) {
if(l1 == null && l2 == null)
return null;
int carry = 0;
ListNode head = new ListNode(0);
ListNode p = head;
while(l1 != null && l2 != null) {
int sum = l1.val + l2.val + carry;
carry = sum / 10;
p.next = new ListNode(sum % 10);
p = p.next;
l1 = l1.next;
l2 = l2.next;
}
while(l1 != null){
int sum = l1.val + carry;
carry = sum / 10;
p.next = new ListNode(sum % 10);
p = p.next;
l1 = l1.next;
}
while(l2 != null){
int sum = l2.val + carry;
carry = sum / 10;
p.next = new ListNode(sum % 10);
p = p.next;
l2 = l2.next;
}
if(carry != 0)
p.next = new ListNode(carry);
return head.next;
}
}