第28次CSP认证题解202212-1现值计算

// CSP202212-1

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        double profit = scan.nextDouble();
        int[] arr = new int[n + 1];
        int i = 0;
        double sum = 0;
        while (i <= n) {
            arr[i] = scan.nextInt();
            sum += arr[i] * Math.pow((1 + profit), -i);
            i++;
        }
        System.out.print(sum);
    }
}