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）
https://www.nowcoder.com/practice/bd7f978302044eee894445e244c7eee6
class Solution:
def NumberOf1Between1AndN_Solution(self , n: int) -> int:
# write code here
count = 0
for i in range(1,n+1):
count_1 = str(i).count('1')
count = count + count_1
return count
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