https://www.hackerrank.com/challenges/balanced-brackets/problem?h_l=interview&playlist_slugs%5B%5D=interview-preparation-kit&playlist_slugs%5B%5D=stacks-queues

Result.java

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

class Result {

    /*
     * Complete the 'isBalanced' function below.
     *
     * The function is expected to return a STRING.
     * The function accepts STRING s as parameter.
     */

public static String isBalanced(String s) {
        // Write your code here
        final Deque<Character> cars = new ArrayDeque<>();
        for (int i = 0; i < s.length(); i++) {
            final Character car = s.charAt(i);
            switch (car) {
                case '(':
                case '[':
                case '{':
                    cars.push(car);
                    break;
                case ')':
                    if (!cars.isEmpty() && '(' == cars.pop()) {
                        break;
                    } else {
                        return "NO";
                    }
                case ']':
                    if (!cars.isEmpty() && '[' == cars.pop()) {
                        break;
                    } else {
                        return "NO";
                    }
                case '}':
                    if (!cars.isEmpty() && '{' == cars.pop()) {
                        break;
                    } else {
                        return "NO";
                    }

            }
        }
        return cars.isEmpty() ? "YES" : "NO";
    }
}

public class Solution {
    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 t = Integer.parseInt(bufferedReader.readLine().trim());

        IntStream.range(0, t).forEach(tItr -> {
            try {
                String s = bufferedReader.readLine();

                String result = Result.isBalanced(s);

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

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