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loopDetection.c
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loopDetection.c
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#include<stdio.h>
#include<stdlib.h>
struct Node
{
int data;
struct Node *next;
}*Head = NULL;
struct Node * createNode(int value)
{
struct Node *node = (struct Node *)malloc(sizeof(struct Node));
node->data = value;
node->next = NULL;
return node;
}
void CreateLinkList(int values[], int length)
{
Head = createNode(values[0]);
struct Node * current, *last = Head;
for (int i = 1; i < length; i++) {
current = createNode(values[i]);
last->next = current;
last = current;
}
}
void PrintList(struct Node *head)
{
while(head != NULL)
{
printf("%d ", head->data);
head = head->next;
}
printf("\n");
}
void CreateLoop(struct Node * head)
{
struct Node *first, *last;
first = head->next;
while(head->next )
{
head = head->next;
}
last = head;
last->next = first;
}
int detectLoop(struct Node *head )
{
struct Node *current , *last;
current = last = head;
do{
current = current->next;
last = last->next;
last = last? last->next:last;
}while(current && last && current != last);
if(current == last){
return 1;
}
else{
return 0;
}
}
int main()
{
int values[] = {1, 6, 4, 7, 8, 5, 3, 2, 9, 10};
CreateLinkList(values, 10);
PrintList(Head);
CreateLoop(Head);
if(detectLoop(Head) == 1)
{
printf("loop detected!!");
}
else{
printf("loop not detected!!");
}
return 0;
}