题解 | 牛牛学数列
牛牛学数列
https://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11?tpId=383&tags=&title=&difficulty=0&judgeStatus=0&rp=0&sourceUrl=%2Fexam%2Foj%3FquestionJobId%3D10%26subTabName%3Donline_coding_page
#include <stdio.h>
int main() {
int a,b;
int sum=0;
int i=1;
scanf("%d",&a);
for(b=1;b<=a;b++){
sum+=b*i;
i = i*-1;
}
printf("%d",sum);
return 0;
}
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