编程语言：Python

解题思想：

1.找出报数的规律

2.注意边界，最好使用while循环，而不要使用for循环控制边界。

在实际认证的时候，笔者就是因为读题不认真，将for循环的边界定为了666，因此只拿到了60分。实际情况中n的次数并不是报数的次数，因此边界定小了。在最终提交之前使用while循环测试了几次都是正确结果，就没有修改为while循环。

时间复杂度：O(n)

IDE代码如下：

People = [0 for i in range(4)]  # 报数列表
N = int(input())  # 输入n
Count = 0
i = 1
while Count != N:
    if i % 7 == 0 or '7' in str(i):
        People[(i - 1) % 4] += 1
    else:
        Count += 1
    i += 1
for i in range(4):
    print(People[i])

< >

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CCF-CSP_20191201:报数

编程语言：Python

解题思想：

时间复杂度：O(n)

IDE代码如下：

评论板

共有 13 条评论

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