题解 | 牛牛学数列4
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
# 换个角度考虑题目给出的数列是n个1,n-1个2,n-2个3一直到1个n的累加
n = int(input())
con = 0
for i in range(1, n + 1):
con += (1 + n - i) * i
print(con)
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
# 换个角度考虑题目给出的数列是n个1,n-1个2,n-2个3一直到1个n的累加
n = int(input())
con = 0
for i in range(1, n + 1):
con += (1 + n - i) * i
print(con)
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