题解 | #牛牛学数列4#
牛牛学数列4
http://www.nowcoder.com/practice/586b114f52034688879342ba45779081
BC86 牛牛学数列4
思路:
step1:每一项都是等差数列求和;累加计算;
代码如下:
n = int(input())
i = 1
c = 0
while i <= n:
c += (1+i)*i/2
i += 1
print(int(c))
牛牛学数列4
http://www.nowcoder.com/practice/586b114f52034688879342ba45779081
n = int(input())
i = 1
c = 0
while i <= n:
c += (1+i)*i/2
i += 1
print(int(c))
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