题解 | #牛群的能量值#

import java.util.*;

/*
 * public class ListNode {
 *   int val;
 *   ListNode next = null;
 *   public ListNode(int val) {
 *     this.val = val;
 *   }
 * }
 */

public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     *
     * @param l1 ListNode类
     * @param l2 ListNode类
     * @return ListNode类
     */
    public ListNode addEnergyValues (ListNode l1, ListNode l2) {
        // write code here
        int flag = 0;
        ListNode temp = l1;
        while (l2 != null && temp != null) {
            int sum = 0;
            int bit = 0;
            sum = temp.val + l2.val + flag;
            bit = sum % 10;
            flag = sum / 10;
            temp.val = bit;
            l2 = l2.next;
            if(temp.next==null&&l2!=null){temp.next=l2;temp=temp.next;break;}
            temp=temp.next;
        }
        
        while (temp != null) {
            int sum = 0;
            sum = flag + temp.val;
            temp.val = sum % 10;
            flag = sum / 10;
            if (temp.next == null) {
                if (flag > 0) {
                    ListNode cur = new ListNode(flag);
                    temp.next = cur;
                    return l1;
                }
            }
            temp = temp.next;
        }
       
        return l1;
    }
}