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