HackerrankPsAlgorithms0044.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class HackerrankPsAlgorithms0044 {
	// Equalize the Array
	// https://www.hackerrank.com/challenges/equality-in-a-array/problem?isFullScreen=true

	// --- You need to fill this method ---
	public static int equalizeArray(List<Integer> arr) {
		Map<Integer, Long> elementCount = arr.stream()
				.collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));
		return arr.size() - elementCount.values().stream().max(Long::compare).get().intValue();
	}

	public static void main(String[] args) throws IOException {
		BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

		int n = Integer.parseInt(bufferedReader.readLine().trim());

		List<Integer> arr = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
				.map(Integer::parseInt)
				.collect(Collectors.toList());

		int result = equalizeArray(arr);

		bufferedWriter.write(String.valueOf(result));
		bufferedWriter.newLine();

		bufferedReader.close();
		bufferedWriter.close();
	}

}