Leetcode Problem 2767. Partition String Into Minimum Beautiful Substrings

2767. Partition String Into Minimum Beautiful Substrings

Leetcode Solutions

Dynamic Programming Approach

  1. Initialize a dynamic programming array dp with size n+1 and fill it with infinity (INF), where n is the length of the string s. Set dp[0] to 0 as the base case.
  2. Iterate through the string s using index i.
  3. If the current character s[i] is '0', skip to the next iteration.
  4. Initialize a variable num to 0 to store the numeric value of the current substring.
  5. Iterate through the string starting from index i to the end using index j.
  6. Update num by shifting its bits to the left and adding the current character's value.
  7. If num exceeds a certain limit, break the loop to avoid overflow.
  8. Check if num is a power of 5 using a helper function isPowerOfFive.
  9. If it is, update dp[j+1] with the minimum of its current value and dp[i]+1.
  10. After the iterations, check if dp[n] is still INF. If it is, return -1, indicating that it's impossible to partition the string into beautiful substrings. Otherwise, return dp[n].
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Recursive Backtracking Approach

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