File System Deduplicator

In a cloud storage system, a folder is considered a duplicate if it contains exactly the same set of file hashes as another folder, regardless of file names. You are given a list of files and their containing folders along with the hash of each file's content. A folder's identity is defined by the collection of hashes it contains. Count how many folders have at least one other folder that is identical to them. Input Format: The first line is N, the number of files. The next N lines contain 'folder_name file_hash' (where file_hash is an integer). Output Format: Print the count of folders that are NOT unique (i.e., their content set exists in at least one other folder). Example: Input: 4 root 12345 root 67890 backup 12345 backup 67890 Output: 2 (Note: both 'root' and 'backup' contain {12345, 67890})