#include <stdio.h>
#include <stdlib.h>
struct Node {
    int data;
    struct Node* next;
};
struct Node* head = NULL;
void insertAtBegin(int value) {
    struct Node* newNode = (struct Node*) malloc(sizeof(struct Node));
    newNode->data = value;
    newNode->next = head;
    head = newNode;
void display() {
    struct Node* temp = head;
    while (temp != NULL) {
        printf("%d -> ", temp->data);
        temp = temp->next;
    }
    printf("NULL\n");
}
int main() {
    insertAtBegin(10);
    insertAtBegin(20);
    insertAtBegin(30);

    printf("Linked List: ");
    display();
    return 0;
}