Leetcode Problem 357. Count Numbers with Unique Digits

357. Count Numbers with Unique Digits

Leetcode Solutions

Dynamic Programming with Precomputed Factorials

  1. Initialize an array factorials to store precomputed factorial values up to 9.
  2. Compute the factorials from 0! to 9! and store them in the factorials array.
  3. Initialize count to 1, which accounts for the number 0.
  4. For each number of digits from 1 to n, calculate the number of unique digit numbers by multiplying the available choices for each digit position.
  5. Add the calculated count for each number of digits to the total count.
  6. Return the total count.
UML Thumbnail

Backtracking to Generate Unique Digit Numbers

Ask Question

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

Suggested Answer

Answer
Full Screen
Copy Answer Code
Loading...