题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
#include <stdio.h>
int main() {
int n=1;
scanf("%d",&n);
int sum=0;
for(int i=0;i<n;i++)
{
int q=2+i*3;
sum=sum+q;
}
printf("%d\n",sum);
return 0;
}
