Arvonta

Note: input/arvonta.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

import java.util.*;
import java.math.BigDecimal;
import java.math.MathContext;

public class arvonta {

	public static void main(String[] args) {

		Scanner input = new Scanner(System.in);

		int t = Integer.parseInt(input.nextLine());
		
		double[] ans = new double[t];
		
		for (int i = 0; i < t; i++) {
			
			int a = input.nextInt();
			int exponent = a;

			BigDecimal c1 = new BigDecimal(a-1);
			BigDecimal d1 = new BigDecimal(a);

			BigDecimal base = c1.divide(d1, 30, BigDecimal.ROUND_HALF_UP);

			BigDecimal result = base.pow(exponent, MathContext.DECIMAL128);
			
			ans[i] = 1.0 - result.doubleValue();
		}


		input.close(); 
		
		
		for (int i3 = 0; i3 < t; i3++) {
			System.out.println(ans[i3]);
		}
		
    }
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED