#480

Number of Digit One

HardMath

Solve the classic problem: "Number of Digit One". This is a hard Math problem commonly asked in placement interviews at top tech companies. Read the examples carefully and think about edge cases before coding your solution.

Examples

Input: Example input goes here

Output: Expected output

Walk through the logic step by step.

Input: Second test case

Output: Another expected output

class Solution:
    def numberofDigitOne(self):
        # Write your solution here
        pass

Output

Run your code to see output here.