new_contents: """Leetcode 72. Edit Distance
  Hard
  
  URL: https://leetcode.com/problems/edit-distance/
  
  Given two words word1 and word2, find the minimum number of operations 
  required to convert word1 to word2.
  
  You have the following 3 operations permitted on a word:
  - Insert a character
  - Delete a character
  - Replace a character
  
  Example 1:
  Input: word1 = "horse", word2 = "ros"
  Output: 3
  Explanation: 
  horse -> rorse (replace 'h' with 'r')
  rorse -> rose (remove 'r')
  rose -> ros (remove 'e')
  
  Example 2:
  Input: word1 = "intention", word2 = "execution"
  Output: 5
  Explanation: 
  intention -> inention (remove 't')
  inention -> enention (replace 'i' with 'e')
  enention -> exention (replace 'n' with 'x')
  exention -> exection (replace 'n' with 'c')
  exection -> execution (insert 'u')
  """
  
  class Solution(object):
      def minDistance(self, word1, word2):
          """
          :type word1: str
          :type word2: str
          :rtype: int
          """
          pass
  
  
  def main():
      pass
  
  
  if __name__ == '__main__':
      main()
  
subject: Add lc0072_edit_distance.py