mediumStringsPattern: Mixed Topics
String Reconfiguration Solution
Problem Statement
Given two strings, determine the minimum number of operations required to transform the first string into the second string, where an operation is defined as either replacing a character, deleting a character, or inserting a character.
Examples
Example 1:
Input:{"str1":"kitten","str2":"sitting"}
Output:3
Explanation: Replace 'k' with 's', replace 'e' with 'i', and append 'g' to transform 'kitten' into 'sitting'
Example 2:
Input:{"str1":"hello","str2":"world"}
Output:4
Explanation: Replace 'h' with 'w', replace 'e' with 'o', replace 'l' with 'r', and replace 'o' with 'd' and then replace the last 'l' with 'd' to transform 'hello' into 'world'
Constraints
- The length of both strings will not exceed 100 characters
- Only lowercase English letters will be used in the strings
- The minimum number of operations is defined as the smallest possible number of insertions, deletions, or substitutions
Time: O(n*m) Space: O(n*m)
The optimized approach uses dynamic programming to build a 2D matrix, where each cell represents the minimum number of operations required to transform the first i characters of the first string into the first j characters of the second string. This approach has a time complexity of O(n*m), where n and m are the lengths of the two strings.
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