注意事项:只关注上、下两数的关系即可
参考代码:
N = int(input())
output = 0
times = 0
def count_sum(up_data, down_data) :
global times, output
times += 1
temp = up_data
output += up_data / down_data
up_data = up_data + down_data
down_data = temp
if times < N :
count_sum(up_data, down_data)
else :
print(round(output, 2))
count_sum(2, 1)
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