题解 | #整数中1出现的次数(从1到n整数中1出现的次数)#
整数中1出现的次数(从1到n整数中1出现的次数)
http://www.nowcoder.com/practice/bd7f978302044eee894445e244c7eee6
# -*- coding:utf-8 -*- class Solution: def NumberOf1Between1AndN_Solution(self, n): # write code here res = "".join([str(i) for i in range(1, n + 1)]) return res.count("1")