题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
def diff(n):
if n == 1:
return 2
else:
return diff(n-1) + 3*n-1
n = int(input())
print(diff(n))
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
def diff(n):
if n == 1:
return 2
else:
return diff(n-1) + 3*n-1
n = int(input())
print(diff(n))
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