HackerrankPsAlgorithms0039.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.stream.IntStream;

public class HackerrankPsAlgorithms0039 {
	// Sherlock and Squares
	// https://www.hackerrank.com/challenges/sherlock-and-squares/problem?isFullScreen=true

	// --- You need to fill this method ---
	public static int squares(int a, int b) {
		return (int) (Math.floor(Math.sqrt(b)) - Math.ceil(Math.sqrt(a)) + 1);
	}

	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 q = Integer.parseInt(bufferedReader.readLine().trim());

		IntStream.range(0, q).forEach(qItr -> {
			try {
				String[] firstMultipleInput = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");

				int a = Integer.parseInt(firstMultipleInput[0]);

				int b = Integer.parseInt(firstMultipleInput[1]);

				int result = squares(a, b);

				bufferedWriter.write(String.valueOf(result));
				bufferedWriter.newLine();
			} catch (IOException ex) {
				throw new RuntimeException(ex);
			}
		});

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

}