Skip to main content

EDIT DISTANCE PROBLEM - LEETCODE 72

 

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:

  1. Insert a character
  2. Delete a character
  3. 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')
Solution:- class Solution {
    public int minDistance(String word1, String word2) {
        
        if(word1.length()==0){
            return word2.length();
        }
         
        if(word2.length()==0){
            return word1.length();
        }
        if(word1.length()==0 && word2.length()==0){
            return 0;
        }
        
        int[][] result=new int[word1.length()+1][word2.length()+1];
        
        for(int i=0;i<=word1.length();i++){
            result[i][0]=i;
        }
            
          for(int j=0;j<=word2.length();j++){
            result[0][j]=j;
        }
        
        for(int i=1;i<=word1.length();i++){
            
           // System.out.println(" row "+i);
            
         for(int j=1;j<=word2.length();j++){
            
                if(word1.charAt(i-1)==word2.charAt(j-1)){
                 //   System.out.println("true");
                    result[i][j]=result[i-1][j-1];
                }
             else{
                 int min=Math.min(result[i-1][j],result[i][j-1]);
                 result[i][j]=Math.min(min,result[i-1][j-1])+1;
                // System.out.println("result[i][j] "+result[i][j]);
             }
        }
            
        }
        
        return result[word1.length()][word2.length()];
        
    }
}



https://leetcode.com/problems/edit-distance/

Comments

.

Popular posts from this blog

Solved: com.microsoft.sqlserver.jdbc.SQLServerException: The index 1 is out of range.

This error usually comes when we try to insert data in a query where there is no index defined for it. Example :- String strQuery=“select * from location where city_id=? ”; The question mark will be the the first index if we want to insert data so if we call a function like- oPreparedStatement = oConnection.prepareStatement(strQuery); oPreparedStatement.setString(1,235); here we are sending 235 as a first parameter so it will work fine but as soon as we write something after it like oPreparedStatement.setString(2,”kanpur”) then it will throw “The index 2 is out of range” since there is no place to send this value in a query hence it will throw the same error. Here index defines the parameter for which there is no place in the query. To rectify this we need to write query like- String strQuery=“select * from location where city_id=? And city_name=? ”; then it will work fine. The cases in which these errors can occur is- 1)Query is co

Heap implementation in JAVA

In this tutorial we will see all the functionalities of heaps implemented through java language. package com . problems . heap ; public class HeapFunctions { //Function to generate maxheapify where root is max than childs public void maxHeapify ( int Arr [], int i , int N ) { int largest ; int left = 2 * i + 1 ; //left child int right = 2 * i + 2 ; //right child System . out . println ( "left" + " " + left ); System . out . println ( "right" + " " + right ); System . out . println ( "Max size" + " " + N ); if ( left < N && Arr [ left ] > Arr [ i ] ) { largest = left ; System . out . println ( "largest left" + largest ); } else { largest = i ; System . out . println ( "largest i" + largest ); } if ( rig