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,count=-1;
scanf("%d",&a);
int i,sum=0;
for(i=1;i<=a;i++)
{
sum+=i*(count*=-1);
}
printf("%d\n",sum);
return 0;
}
