[NK]从尾到头打印链表

从尾到头打印链表这里写链接内容
题目描述
输入一个链表,按链表值从尾到头的顺序返回一个ArrayList。

#include "stdafx.h"
#include <iostream>
using namespace std;
#include <vector>


 struct ListNode {
       int val;
       struct ListNode *next;
       ListNode(int x) :
              val(x), next(NULL) {
        }
  };

class Solution {
public:
    vector<int> printListFromTailToHead(ListNode* head) {
        ListNode* ln = head;
        vector<int> v;
        while (ln!=NULL)
        {
            //v.push_back(ln->val); //v[0:4]->5,4,3,2,1 每次放在最后(下标大的)
            v.insert(v.begin(),ln->val);   //v[0:4]-> 1,2,3,4,5 每次放在最前(下标小的)
            ln = ln->next;
        }
        return v;
    }
};


int main()
{
    ListNode ln(5);
    Solution *s = new Solution();
    vector<int> v;
    vector<int>::iterator it;

    ListNode *node2 = new ListNode(4);
    ln.next = node2;
    ListNode *node3 = new ListNode(3);
    ln.next->next = node3;
    ListNode *node4 = new ListNode(2);
    ln.next->next->next = node4;
    ListNode *node5 = new ListNode(1);
    ln.next->next->next->next = node5;

    v = s->printListFromTailToHead(&ln);
    it = v.begin();
    while (it!=v.end())
    {
        cout << *it << endl;
        it++;
    }
    return 0;
}
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