Leetcode Problem 2896. Apply Operations to Make Two Strings Equal

2896. Apply Operations to Make Two Strings Equal

Leetcode Solutions

Dynamic Programming with Two Pointers

  1. Initialize a list diffs to store the indices where s1 and s2 differ.
  2. If the length of diffs is odd, return -1 as it is impossible to make the strings equal.
  3. Initialize DP variables dp_i_plus_two, dp_i_plus_one, and dp_i to keep track of the costs.
  4. Iterate over the indices in diffs in reverse order, calculating the minimum cost for each index.
  5. For each index idx, calculate dp_i as the minimum of dp_i_plus_one + x / 2 and dp_i_plus_two + diffs[idx + 1] - diffs[idx].
  6. Update dp_i_plus_two and dp_i_plus_one for the next iteration.
  7. Return the minimum cost to make the strings equal, which is stored in dp_i after the loop.
UML Thumbnail

Greedy Approach with Cost Analysis

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