题解 | 牛牛学数列
牛牛学数列
https://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11
using System;
public class Program {
public static void Main() {
int n = int.Parse(Console.ReadLine());
int sum = 0;
for (int i = 1; i <= n; i++){
sum += ((int)Math.Pow(-1, i - 1)) * i;
}
Console.WriteLine(sum);
}
}
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