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 sum1 = 0; int sum2 = 0; for(int i = 1; i<=n; i++) { sum1 += i; sum2 += sum1; } printf("%d\n", sum2); return 0; }