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,sum1=0,sum=0,i=0;
scanf("%d",&n);
for(i=1;i<=n;i++)
{
sum=sum+i;
sum1=sum1+sum;
}
printf("%d\n",sum1);
return 0;
}
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