题解 | 牛牛学数列4
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
n=int(input()) print(n * (n + 1) * (n + 2) // 6)
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
n=int(input()) print(n * (n + 1) * (n + 2) // 6)
相关推荐