import java.util.*;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;

public class ListIndexer {

public static void main(String[] args) throws IOException {

List<String> lists = new ArrayList<>();

String filePath = args[0]; // File containing lists (one list per line, comma separated)

loadListsFromFile(filePath, lists);

if (lists.isEmpty()) {

System.out.println("No lists loaded. Exiting.");

return;

}

// Indexing and diagnostics

for (int i = 0; i < lists.size(); i++) {

System.out.println("--- List " + (i + 1) + " ---");

List<String> list = lists.get(i);

System.out.println("List size: " + list.size());

System.out.println("Unique elements: " + getUniqueElements(list).size());

System.out.println("First 10 elements: " + list.subList(0, Math.min(10, list.size())));

System.out.println("---");

}

}

private static void loadListsFromFile(String filePath, List<String> lists) throws IOException {

try {

Files.lines(Paths.get(filePath)).forEach(line -> {

String[] items = line.split(",");

lists.add(Arrays.asList(items)); // Convert array to list

});

} catch (IOException e) {

System.err.println("Error reading file: " + e.getMessage());

throw e;

}

}

private static Set<String> getUniqueElements(List<String> list) {

Set<String> uniqueElements = new HashSet<>(list); // Use HashSet for uniqueness

return uniqueElements;

}

}