题解 | #牛牛学数列#
牛牛学数列
https://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11
#include <stdio.h>
int main() {
int a,i;
int sum=0;
scanf("%d",&a);
if(a%2==0)
printf("%.0f",1.0/4+(-1.0/4-a/2.0));
else
printf("%.0f",1.0/4-(-1.0/4-a/2.0));
return 0;
}
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