Question: Given an integer n , count the total number of digit 1 appearing in all non - negative integers less than or equal to n

Given an integer n, count the total number of digit 1 appearing in all non-negative integers less than or equal to n.
Example 1:
Input: n =13
Output: 6
Example 2:
Input: n =0
Output: 0
Constraints:
0<= n <=109

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