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