内容简介:简单的思路,就是首先交换但是
基本思路
简单的思路,就是首先交换 root->next
和 revert_root
的指向,此时已经逆置了一个元素
但是 root
和 revert_root
就反了,再交换下就 ok 了
直接上代码
/* Author: SpringHack - springhack@live.cn Last modified: 2019-04-02 01:32:40 Filename: main.c Description: Created by SpringHack using vim automatically. */ #include <stdio.h> #include <stdlib.h> #include <string.h> // Test data int test_data[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; // Node struct typedef struct _node { int value; struct _node* next; } node_item; // Just easy to use malloc typedef node_item* node; // Define linked list root and reverted linked list root // Only two variables needed to revert a linked list static node root = NULL; static node revert_root = NULL; int main() { // Create linked list { int i = 0, count = sizeof(test_data) / sizeof(int); node tmp; while (i < count) { if (!root) { root = (node)malloc(sizeof(node_item)); tmp = root; } else { tmp->next = (node)malloc(sizeof(node_item)); tmp = tmp->next; } tmp->next = NULL; tmp->value = test_data[i]; ++i; } } // Print linked list { node tmp = root; while (tmp) { printf(tmp->next ? "%d " : "%d", tmp->value); tmp = tmp->next; } printf("\n"); } // Revert linked list { while (root) { if (!revert_root) { revert_root = root; root = root->next; revert_root->next = NULL; } else { revert_root = (node)((intptr_t)revert_root ^ (intptr_t)root->next); root->next = (node)((intptr_t)revert_root ^ (intptr_t)root->next); revert_root = (node)((intptr_t)revert_root ^ (intptr_t)root->next); revert_root = (node)((intptr_t)revert_root ^ (intptr_t)root); root = (node)((intptr_t)revert_root ^ (intptr_t)root); revert_root = (node)((intptr_t)revert_root ^ (intptr_t)root); } } } // Print reverted linked list { node tmp = revert_root; while (tmp) { printf(tmp->next ? "%d " : "%d", tmp->value); tmp = tmp->next; } printf("\n"); } return 0; }
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