DIY: Edit Distance

Problem statement

Given two strings, str1 and str2, you have to return the minimum number of edit operations that are required to convert str1 to str2.

Note: You are allowed to insert, delete, or replace characters for this conversion.

Input

The input will be two strings. Here are some examples of the input to the function:

// Sample Input 1:
str1 = "intention", str2 = "execution"

// Sample Input 2:
str1 = "abdca", str2 = "cbda"

// Sample Input 3:
str1 = "passport", str2 = "ppsspqrt"

Output

The output will be an integer. Here are some examples of the output:

// Sample Output 1:
5

// Sample Output 2:
2

// Sample Output 3:
2