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