Check Empty List

Easy Singly Linked List: Basics

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Problem Statement

Write a C program to check whether a singly linked list is empty (print 1 if empty, 0 otherwise).

Input Format

An integer flag (0 for empty, 1 for non-empty with sample data).

Output Format

Print 1 if the list head is NULL, else 0.

Constraints

Flag is 0 or 1

Sample Output

Explanation

Verify if the head pointer of the linked list points to NULL.

Starter Code

#include <stdio.h>
#include <stdlib.h>

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

int main() {
    int flag;
    if (scanf("%d", &flag) == 1) {
        struct Node *head = NULL;
        if (flag == 1) {
            head = (struct Node *)malloc(sizeof(struct Node));
            head->data = 10;
            head->next = NULL;
        }
        // Write your code here to check if list is empty
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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