Regular Bracket Sequence

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/**
 *
 * @author henpeura
 */
public class RegularBracket {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        IO io = new IO();
        int length = io.nextInt();
        int squareStart = io.nextInt();
        int squareEnd = io.nextInt();
        io.println(createSequence(length, squareStart, squareEnd));
        io.close();
    }

    private static String createSequence(int length, int squareStart, int squareEnd) {
        if (length % 2 != 0) {
            return "QAQ";
        }
        if ((squareEnd - squareStart) % 2 == 0) {
            return "QAQ";
        }
        StringBuilder sequence = new StringBuilder();
        boolean closeBracket = false;
        boolean closeSquare = false;
        int index = 1;
        while (index <= length) {
            if (index < squareStart || index > squareEnd) {
                if (closeBracket) {
                    sequence.append(")");
                    closeBracket = false;
                } else {
                    sequence.append("(");
                    closeBracket = true;
                }
            } else {
                if (closeSquare) {
                    sequence.append("]");
                    closeSquare = false;
                } else {
                    sequence.append("[");
                    closeSquare = true;
                }
            }
            index++;
        }
        return sequence.toString();
    }
    
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED

Test 28

Verdict: ACCEPTED

Test 29

Verdict: ACCEPTED

Test 30

Verdict: ACCEPTED