题解 | #牛牛学数列#
牛牛学数列
https://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11
#include <iostream>
using namespace std;
int main() {
int n, sum = 0;
scanf("%d", &n);
for(int i = 1; i <= n; i++)
{
if(i%2) sum +=i; //加减数字的规律是看数字的奇偶性，奇数加，偶数减
else sum -= i;
}
printf("%d", sum);
return 0;
}
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