題目來源：
http://zhedahht.blog.163.com/blog/static/254111742010819104710337/題目：有一個復雜鏈表，其結點除了有一個
m_pNext指針指向下一個結點外，還有一個m_pSibling指向鏈表中的任一結點或者NULL。其結點的C++定義如下：
struct ComplexNode
{
int m_nValue;
ComplexNode* m_pNext;
ComplexNode* m_pSibling;
};
代碼：
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct Node {
char value;
struct Node *next;
struct Node *random;
};
void test_print(struct Node *);
struct Node *
list_copy_with_random_pointer(struct Node *head)
{
struct Node *tmp, *ptr, *ret;
ptr = head;
while(ptr != NULL) {
tmp = (struct Node *)malloc(sizeof(struct Node));
tmp->value = (ptr->value)-32; /* from lowercase to uppercase, just for testing */
tmp->next = ptr->next;
tmp->random = NULL;
ptr->next = tmp;
ptr = ptr->next->next;
}
ptr = head;
while(ptr != NULL) {
ptr->next->random = ptr->random==NULL ? NULL : ptr->random->next;
ptr = ptr->next->next;
}
ptr = head;
ret = (head==NULL ? NULL : (head->next));
while(ptr != NULL) {
tmp = ptr->next;
ptr->next = ptr->next->next;
tmp->next = ptr->next==NULL ? NULL : ptr->next->next;
ptr = ptr->next;
}
return ret;
}
void
test_print(struct Node *head)
{
while(head != NULL) {
printf("%c: [%c, %c]\n", head->value, head->next==NULL?'-':head->next->value, head->random==NULL?'-':head->random->value);
head = head->next;
}
}
int
main(int argc, char **argv)
{
struct Node d = {'d', NULL, NULL};
struct Node c = {'c', &d, NULL};
struct Node b = {'b', &c, NULL};
struct Node a = {'a', &b, NULL};
a.random = &c;
d.random = &b;
test_print(&a);
struct Node *copy = list_copy_with_random_pointer(&a);
printf("\n\n");
test_print(&a);
printf("\n\n");
test_print(copy);
return 0;
}