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,i,sum=0,a=0;
scanf("%d",&n);
for(i=1;i<=n;i++)
{
sum+=i;
a+=sum;
}
printf("%d",a);
return 0;
}
