题解 | #牛牛学数列#
牛牛学数列
http://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11
import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner scanner = new Scanner(System.in);
int length = scanner.nextInt();
int target = 0;
for(int index = 1; index <= length; index++){
target += (index & 1) == 1 ? index : -index;
}
System.out.print(target);
}
}
