LeetCode-002 Add Two Numbers
2017-09-10 21:08
411 查看
Description
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.
Example
Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)Output: 7 -> 0 -> 8
Analyse
题目大意很简单,就一个高精度加法的链表形式,不需要考虑时间复杂度和空间复杂度的问题。我的代码有点长,主要是自己在写的时候,没想着把代码都写在一起,只是处理了该处理的问题。Code
/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */ class Solution { public: ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) { int sum=0,up=0; ListNode *ans=NULL,*head; //up用来存进位,这里主要处理l1与l2最低位数的加法 while (l1!=NULL && l2!=NULL) { if (up==1) { sum=l1->val+l2->val+1; } else { sum=l1->val+l2->val; } if (sum>=10) { sum-=10; up=1; } else { up=0; } if (ans==NULL) { ans=new ListNode(sum); head=ans; } else { ListNode* nextnum=new ListNode(sum); ans->next=nextnum; ans=ans- 4000 >next; } l1=l1->next; l2=l2->next; } //多余的位数的加法再后面这里特殊处理 while (l1!=NULL) { ListNode *nextnum; if (up==1) { if (l1->val+1>=10) { nextnum=new ListNode(l1->val-9); } else { nextnum=new ListNode(l1->val+1); up=0; } } else { nextnum=new ListNode(l1->val); } ans->next=nextnum; ans=ans->next; l1=l1->next; } while (l2!=NULL) { ListNode *nextnum; if (up==1) { if (l2->val+1>=10) { nextnum=new ListNode(l2->val-9); } else { nextnum=new ListNode(l2->val+1); up=0; } } else { nextnum=new ListNode(l2->val); } ans->next=nextnum; ans=ans->next; l2=l2->next; } //若加完之后还有进位,则还需要处理一下,如99+1=100 if (up==1) { ListNode *nextnum=new ListNode(1); ans->next=nextnum; } return head; } };
其实这里的许多while循环都可以用if语句去合并,比如说多余的位数处理可以一般化的,若一个为NULL而另一个不为NULL,则视作加零即可。不过当时没想这么多。
相关文章推荐
- leetcode [002] : Add Two Numbers
- leetcode 002 Add Two Numbers(java)
- LeetCode 002 Add Two Numbers
- 002_LeetCode_2 Add Two Numbers 题解
- leetcode-002 Add Two Numbers
- LeetCode002 Add Two Numbers
- leetcode刷题: 002 Add Two Numbers
- LeetCode002__Add Two Numbers
- Add Two Numbers - leetcode002
- 002 Add Two Numbers [Leetcode]
- [LeetCode 002] Add Two Numbers
- 【JAVA、C++】LeetCode 002 Add Two Numbers
- 【leetcode】002 Add Two Numbers
- LeetCode 002 Add Two Numbers
- 【Leetcode】002 Add Two Numbers
- [Leetcode题解]002 Add Two Numbers
- 【LeetCode-面试算法经典-Java实现】【002-Add Two Numbers (单链表表示的两个数相加)】
- leetcode002:Add Two Numbers
- LeetCode 002 AddTwoNumbers
- leetcode 002 —— add two numbers