Minimum Deletions & Insertions to Transform a String into another

Grokking Dynamic Programming Patterns for Coding Interviews

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Problem Statement

Given strings s1 and s2, we need to transform s1 into s2 by deleting and inserting characters. Write a function to calculate the count of the minimum number of deletion and insertion operations.

Example 1:

Input: s1 = "abc"
       s2 = "fbc"
Output: 1 deletion and 1 insertion.
Explanation: We need to delete {'a'} and insert {'f'} to s1 to transform it into s2.

Example 2:

Input: s1 = "abdca"
       s2 = "cbda"
Output: 2 deletions and 1 insertion.
Explanation: We need to delete {'a', 'c'} and insert {'c'} to s1 to transform it into s2.

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