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