Leetcode Problem 2827. Number of Beautiful Integers in the Range

2827. Number of Beautiful Integers in the Range

Leetcode Solutions

Digit Dynamic Programming (DP) Approach

  1. Convert the low and high bounds to strings for easier digit manipulation.
  2. Define a recursive function dp with parameters: current index, tight constraint (whether we are at the edge of the current bounds), count of even digits, count of odd digits, current remainder modulo k, and a flag indicating whether we have started forming the number (to handle leading zeros).
  3. In the base case, if the current index is equal to the length of the number, check if the count of even and odd digits are equal and if the number is divisible by k (remainder is 0).
  4. If the state has been computed before, return the cached result.
  5. Iterate over possible digits for the current position, updating the state accordingly and recursively calling the dp function.
  6. Cache the result of the current state before returning it.
  7. Call the dp function for the high bound and subtract the result of calling dp for the low - 1 bound to get the final count of beautiful integers.
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Brute Force with Digit Counting

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