Viral Outbreak Tracking

In a social network of N users, an infection is spreading. Some users are initially infected. When two users are connected by a link, if either user belongs to an infected component, the entire merged component becomes infected. Given the initial set of I infected users and M links formed over time, calculate the total number of infected users after all links are processed. Example: Input: 5 2 1 0 0 1 2 3 N=5, 1 initially infected (user 0). Link 0-1: {0,1} becomes infected (2 users). Link 2-3: {2,3} is healthy. Final Infected: 2 (users 0 and 1).