Access Pattern Fingerprinting

In a security audit, we want to find users who share identical access patterns. A user's access pattern is the set of unique resources they have accessed, regardless of the order or frequency. Given a list of user-resource pairs, find the size of the largest group of users who have accessed the exact same set of resources. Input Format: N (number of access logs). Then N lines of 'username resource_id'. Output Format: Print the size of the largest group of users with identical resource sets. Example: Input: 6 admin server1 admin server2 guest server1 dev server2 dev server1 root server3 Output: 2 (Explanation: 'admin' and 'dev' both accessed {server1, server2}.)