题目解析
求给定数列的调和平均值
解题思路
直接计算 调和平均值
代码
import java.io.*;
import java.math.*;
import java.util.*;
public class Main
{
public static void main(String[] args)
{
int n = sc.nextInt();
double sum = 0;
for (int i = 1; i <= n; i++)
{
double a = sc.nextDouble();
sum += 1.0 / a;
}
out.printf("%.2f", 1.0 / (sum / n));
out.flush();
out.close();
}
static Scanner sc = new Scanner(System.in);
static PrintWriter out = new PrintWriter(System.out);
}