String Conversion String Conversion
English

- Oh. This new generation of robots is trying to do everything faster than is needed.

- Come on!! Gaffer! Can I just replace a string and that's all.

- No, young man. You can’t “just replace a string”. You should respect your memory cards, even though you have a lot of them. Now sit and think a little bit. How can this string can be replaced in a most efficient way?

- Ok ok. As you wish. Now I should respect even my own hardware.

You are given two strings, line1 and line2. Answer, what is the smallest number of operations you need to transform line1 to line2?

Operations are:

  • Delete one letter from one of strings
  • Insert one letter into one of strings
  • Replace one of letters from one of strings with another letter

Input: two arguments, two strings.

Output: int, minimum number of operations.

Example:

steps_to_convert('line1', 'line1') == 0
steps_to_convert('line1', 'line2') == 1
steps_to_convert('ine', 'line2') == 2

Precondition: 0 <= len(line) < 100