题解 | 牛牛学数列
牛牛学数列
https://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11
#include <stdio.h>
int main()
{
int n,sum=0;
scanf("%d",&n);
for(int i=1;i<=n;i++){
if(i%2==1){
sum+=i;
}else{
sum-=i;
}
}
printf("%d\n",sum);
return 0;
}
