Leetcode Problem 2911. Minimum Changes to Make K Semi-palindromes

2911. Minimum Changes to Make K Semi-palindromes

Leetcode Solutions

Dynamic Programming with Preprocessing

  1. Precompute the minimum number of changes required to make each substring a semi-palindrome and store the results.
  2. Initialize a DP table dp with dimensions (n+1) x (k+1) where n is the length of the string s.
  3. Set dp[0][0] to 0, as no changes are needed for an empty string.
  4. Iterate over the length of the string from 1 to n.
  5. For each length i, iterate over the number of partitions from 1 to k.
  6. For each partition count j, find the minimum cost of partitioning the string into j parts by trying all possible partition points.
  7. Update the DP table with the minimum cost found.
  8. Return the value of dp[n][k] as the final answer.
UML Thumbnail

Simple DP

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