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;
// 数列的总和
int sum = 0;
// 用作符号的变量
int sign = 1;
scanf("%d", &n);
for (int i = 1; i <= n; i++)
{
sum += (i * sign);
sign = (-sign);
}
printf("%d", sum);
return 0;
}
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