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 = 0;
int i = 0;
int sum = 0;
scanf("%d",&a);
for (i=1; i<=a; i++)
{
if (i%2==0)
{
i = -i;
}
sum += i;
if (i%2==0)
{
i = -i;
}
}
printf("%d",sum);
return 0;
}
