题解 | 牛牛学数列3
牛牛学数列3
https://www.nowcoder.com/practice/f65c726d081c4160a9356eabf0dc21d9
using System;
public class Program {
public static void Main() {
double n = double.Parse(Console.ReadLine());
double s1 = 0;
double s2 = 0;
for (double i = 1; i <= n; i++){
s1 += Math.Pow(-1, i - 1) * (2 * i - 1) ;
s2 += 1 / s1;
}
Console.WriteLine("{0:f3}",s2);
}
}
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