题解 | #牛牛学数列4#
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
#include <stdio.h>
int main() {
int n=0;
int sum1=0;
int sum2=0;
scanf("%d",&n);
for(int i=1;i<=n;i++)
{
sum1=sum1+i;
sum2=sum2+sum1;
}
printf("%d",sum2);
return 0;
}
