HackerrankPsAlgorithms0068.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 HackerrankPsAlgorithms0068 {
	// Alternating Characters
	// https://www.hackerrank.com/challenges/alternating-characters/problem?isFullScreen=true

	// --- You need to fill this method ---
	public static int alternatingCharacters(String s) {
		int result = 0;
		for (int i = 1; i < s.length(); i++) {
			if (s.charAt(i) == s.charAt(i - 1)) {
				result++;
			}
		}
		return result;
	}

	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 s = bufferedReader.readLine();

				int result = alternatingCharacters(s);

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

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

}