public class j{
public static void main(String[] args){
	int n = 2;
	int open = n;
	int close = n;
	String op = " ";
	findAns(op, open, close);
}
private static void findAns(String op, int open, int close){
	if (open == 0 && close == 0){
		System.out.println(op);
	}
	
	if (open == close){
		String op1 = op + "(";
		findAns(op1, open - 1, close);
		return;
	}
	if (open != 0){
		String op1 = op + "(";
		open = open - 1;
		findAns(op1, open, close);
	}
	String op1 = op + ")";
	close = close - 1;
	findAns(op1, open, close);
	return;
}	}

if (open == 0 && close == 0){
    System.out.println(op);
--> return;
}