HDOJ 2178 猜数字(水题)

HDACM 2178

import java.util.Scanner;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        while(t-->0){
            int n = sc.nextInt();
            System.out.println((int)Math.pow(2, n)-1);
        }
        sc.close();
    }
}