题解 | #整数中1出现的次数

# -*- coding:utf-8 -*-
class Solution:
    def NumberOf1Between1AndN_Solution(self, n):
        # write code here
        res = 0
        for i in range(1,n+1):
            str_i = str(i)
            m = len(str_i)
            for j in range(m):
                if str_i[j]=='1':
                    res+=1
        return res