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