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