Leetcode2. Add Two Numbers
Posted 于淼
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Problem:
You are given two non-empty linked lists representing two non-negative integers. 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.
You may assume the two numbers do not contain any leading zero, except the number 0 itself.
Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8
Resolution
public ListNode addTwoNumbers(ListNode l1,ListNode l2){ int carry =0;//每一位的数值 ListNode p,result = new ListNode(0); p=result; while(l1!=null||l2!=null||carry!=0){ if(l1!=null){ carry+=l1.val; l1=l1.next; } if (l2!=null){ carry+=l2.val; l2=l2.next; } p.next=new ListNode(carry%10); carry/10; p=p.next; } return result.next; }
注:
①需要保证l1或l2非空。在carry!=0时也要继续进行计算的原因是当l1与l2均进行完加法,到达链表末尾,不会出现溢出问题。
②处理方式并非相对l1与l2的val加和在赋值给carry,而是carry+=l1.val,在carry+=l2.val;
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