题目:输入一个链表的头结点,从尾到头反过来打印出每个结点的值
解题思路:
首先遍历链表,然后将结点依次存入栈中,然后再通过栈打印结点信息。
代码如下:
#include <iostream>
#include <stack>
struct ListNode
{
int data;
ListNode *next;
};
// 尾插法建立链表
void CreateListR(ListNode *&p_Head, int *arr, int len)
{
if (arr)
{
ListNode* p, *s;
p_Head = (ListNode*)malloc(sizeof(ListNode));
p_Head->next = NULL;
p = p_Head;
for (int i = 0; i < len; i++)
{
s = (ListNode*)malloc(sizeof(ListNode));
s->data = arr[i];
p->next = s;
p = p->next;
}
p->next = NULL;
p_Head = p_Head->next;
}
}
// 打印链表结点信息
void PrintList(ListNode *p_Head)
{
while (p_Head)
{
std::cout << p_Head->data << " ";
p_Head = p_Head->next;
}
std::cout << std::endl;
}
// 逆序打印链表结点信息
void PrintListReverse(ListNode* p_Head)
{
std::stack<ListNode*> nodes;
while (p_Head)
{
nodes.push(p_Head);
p_Head = p_Head->next;
}
while (!nodes.empty())
{
std::cout << nodes.top()->data << " ";
nodes.pop();
}
std::cout << std::endl;
}
int main()
{
ListNode* list;
int arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
CreateListR(list, arr, 10);
PrintList(list);
PrintListReverse(list);
system("pause");
return 0;
}