1: Title Description
Enter an integer n, n ~ 1 seek the n represents an integer of decimal number 1 appears.
For example, these input 12,1 to 12 contain the digital integer of 1 and 12, 1, 10, 11 have appeared in a total of 5 times.
Example 1:
Input: n = 12
Output: 5
Example 2:
Input: n = 13
Output: 6
limit:
1 <= n < 2^31
Source: stay button (LeetCode)
link: https: //leetcode-cn.com/problems/1nzheng-shu-zhong-1chu-xian-de-ci-shu-lcof
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