Event Participation Groups

In an events management system, users can sign up for events. If two users sign up for the same event, they belong to the same participation group. Write a program to determine how many distinct participation groups exist after processing all sign-ups. Input format: - The first line contains an integer n (1 ≤ n ≤ 1000), the number of users. - The second line contains an integer e (0 ≤ e ≤ 10000), the number of events. - The following e lines contain pairs (a, b) representing that user a and user b signed up for the same event. Output format: - Output a single integer, the number of distinct participation groups. Example: Input: 4 4 0 1 1 2 2 3 0 3 Output: 1