Leetcode Problem 233. Number of Digit One

233. Number of Digit One

Leetcode Solutions

Mathematical Approach to Counting Digit Ones

  1. Initialize count to 0, which will hold the total count of digit '1'.
  2. Start a loop with i from 1 and keep multiplying it by 10 in each iteration until i is less than or equal to n.
  3. For each i, calculate the number of full sets of '1's as (n / (i * 10)) * i.
  4. Calculate the number of additional '1's as min(max((n % (i * 10)) - i + 1, 0), i).
  5. Add both these numbers to count.
  6. Return count after the loop ends.
UML Thumbnail

Brute Force Approach to Counting Digit Ones

Ask Question

Programming Language
image/screenshot of info(optional)
Full Screen
Loading...

Suggested Answer

Answer
Full Screen
Copy Answer Code
Loading...