題目連接:https://leetcode-cn.com/problems/add-two-numbers/
題目:
Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8
思路:
思路非常簡單,利用兩個指針分別遍歷兩個鏈表,並且用一個變量表示是否有進位。某個鏈表遍歷結束之後再將另一個鏈表連接在結果鏈表之後即可,若最後有進位需要添加一位。
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
int jw =0;
ListNode result = new ListNode(0);
ListNode re = result;
while(l1!=null || l2!=null){
int va1 = 0;
if(l1 != null){
va1 = l1.val;
l1 = l1.next;
}
int va2 = 0;
if(l2 != null){
va2 = l2.val;
l2 = l2.next;
}
int tmp = va1 + va2 + jw;
re.next = new ListNode(tmp%10);
jw = tmp/10;
re = re.next;
}
if(jw!=0){
re.next = new ListNode(jw);
}
return result.next;
}
}