单链表原地逆置递归与非递归解法

最新推荐文章于 2020-07-24 23:18:37 发布

最新推荐文章于 2020-07-24 23:18:37 发布 · 190 阅读

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本文介绍了一种使用C语言实现的链表反转算法，包括非递归解法和递归解法，并通过具体实例展示了如何创建链表并进行反转操作。

#include <stdio.h>

typedef struct LinkNode
{
	int data;
	struct LinkNode *next;
} Node;

//非递归解法
Node* reverse1(Node* header) {
	Node* p = header->next;
	header->next = NULL;
	Node* q = p->next;
	while(q) {
		p->next = header;
		header = p;
		p = q;
		q = p->next;
	}

	p->next = header;
	header = p;
	return header;
}

//递归解法
Node* reverse2(Node* header) {
	if(header == 0 || header->next == 0)
		return header;

	Node* p = header->next;
	Node* q = reverse2(p);
	p->next = header;
	header->next = 0;
	return q;
}

int main() {
	Node h = {1, 0};
	Node* head = &h;
	Node node1 = {3, 0};
	Node node2 = {2, 0};
	Node node3 = {4, 0};
	Node node4 = {7, 0};
	Node node5 = {6, 0};
	Node node6 = {5, 0};

	head->next = &node1;
	node1.next = &node2;
	node2.next = &node3;
	node3.next = &node4;
	node4.next = &node5;
	node5.next = &node6;
	node6.next = NULL;

	Node* p = reverse2(head);
	while(p) {
		printf("p->data = %d\n", p->data);
		p = p->next;
	}

	return 0;
}