标签：des style blog class code c
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You are given two linked lists representing two non-negative numbers. 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.
Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8
题意：给定两个代表数字的链表，每个节点里存放一个digit，数字是逆方向的，将这两个链表相加起来
思路：
1.i, j遍历l1,l2至最长，短的补零
2..设置一个进位变量c, 第i次遍历 l1,l2,c的和除以10进位，mod10留在这一位
3.出循环后还要检查是不是还有进位
复杂度：O(m+n)， 空间O(m+n)
相关题目：
Add Binary
/**
* 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) {
ListNode *result = NULL, *cur = NULL;
int c = 0, s1 = 0, s2 = 0;
for(ListNode *i = l1; i != NULL; i = i->next) s1++;
for(ListNode *i = l2; i != NULL; i = i->next) s2++;
for(ListNode *i =l1, *j = l2; i != NULL || j != NULL; ){
int val1 = i == NULL ? 0 : i->val;
int val2 = j == NULL ? 0 : j->val;
int r = (val1 + val2 + c) % 10;
c = (val1 + val2 + c) / 10;
if(result == NULL) cur = (result = new ListNode(r));
else {
cur->next = new ListNode(r);
cur = cur->next;
}
//
if(i != NULL) i = i->next;
if(j != NULL) j = j->next;
}
if(c) cur->next = new ListNode(c);
return result;
}
};Leetcode 线性表 数 Add Two Numbers,布布扣,bubuko.com
Leetcode 线性表 数 Add Two Numbers
标签：des style blog class code c
原文地址：http://blog.csdn.net/zhengsenlie/article/details/25838129
