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  • LeetCode 2 Add Two Numbers 模拟,读题 难度:0

    https://leetcode.com/problems/add-two-numbers/

    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

    /**
     * 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* res = new ListNode(0);
            int tmp = 0,cnt = 0;
            ListNode * result = res;
            while(l1||l2||cnt){
                tmp = cnt;
                tmp += (l1?l1->val:0) + (l2?l2->val:0);
                cnt = tmp / 10;
                tmp %= 10;
                if(l1)l1=l1->next;
                if(l2)l2=l2->next;
                res->val = tmp;
                if(l1||l2||cnt){
                    res->next = new ListNode(0);
                    res = res->next;
                }
            }
            return result;
        }
    };
    

      

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  • 原文地址:https://www.cnblogs.com/xuesu/p/4762610.html
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