1120 -- 子序列的和

子序列的和

Time Limit:1000MS  Memory Limit:65536K
Total Submit:140 Accepted:89

Description

输入两个整数0 < n < m < 10^6 输出1/n^2+1/(n+1)^2+....+1/m^2保留5位小数，例如n=2 m=4 答案是0.42361 n=65536 m=655360 答案是0.00001.

Input

n m

Output

1/n^2+1/(n+1)^2+....+1/m^2保留5位小数

Sample Input

2 4 
65535 655350

Sample Output

0.42361
0.00001

Source

lrj程序入门

Total Submit:140 Accepted:89

Description

输入两个整数0 < n < m < 10^6 输出1/n^2+1/(n+1)^2+....+1/m^2保留5位小数，例如n=2 m=4 答案是0.42361 n=65536 m=655360 答案是0.00001.

Input

n m

Output

1/n^2+1/(n+1)^2+....+1/m^2保留5位小数

Sample Input

2 4 
65535 655350

Sample Output

0.42361
0.00001

Source

lrj程序入门

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    namespace AK1120 {
        class Program {
            static void Main(string[] args) {
                string sb;
                while ((sb = Console.ReadLine()) != null) {
                    string[] s = sb.Split();
                    long n = long.Parse(s[0]), m = long.Parse(s[1]);
                    double sum = 0;
                    for (long i = n; i <= m; i++) {
                        sum += (1.0 / (i * i));
                    }
                    Console.WriteLine(sum.ToString("0.00000"));
                }
            }
        }
    }