Java String Distance editDistance(String word1, String word2)

Description

edit Distance

License

Apache License

Declaration

public static int editDistance(String word1, String word2) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

public class Main {
    public static int editDistance(String word1, String word2) {
        int len1 = word1.length();
        int len2 = word2.length();

        // len1+1, len2+1, because finally return dp[len1][len2]
        int[][] dp = new int[len1 + 1][len2 + 1];

        for (int i = 0; i <= len1; i++) {
            dp[i][0] = i;//from   www  .jav a2s  . c  om
        }

        for (int j = 0; j <= len2; j++) {
            dp[0][j] = j;
        }

        //iterate though, and check last char
        for (int i = 0; i < len1; i++) {
            char c1 = word1.charAt(i);
            for (int j = 0; j < len2; j++) {
                char c2 = word2.charAt(j);

                //if last two chars equal
                if (c1 == c2) {
                    //update dp value for +1 length
                    dp[i + 1][j + 1] = dp[i][j];
                } else {
                    int replace = dp[i][j] + 1;
                    int insert = dp[i][j + 1] + 1;
                    int delete = dp[i + 1][j] + 1;

                    int min = replace > insert ? insert : replace;
                    min = delete > min ? min : delete;
                    dp[i + 1][j + 1] = min;
                }
            }
        }

        return dp[len1][len2];
    }
}

Related

1. editDistance(String s, String t)
2. editDistance(String s0, String s1)
3. EditDistance(String s1, String s2)
4. editDistance(String str1, String str2)
5. editDistance(String string1, String string2)
6. Sqr(String[] X)