56 lines
1.3 KiB
Java
56 lines
1.3 KiB
Java
/**
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*
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* @author Kshitij VERMA (github.com/kv19971)
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* LEVENSHTEIN DISTANCE dyamic programming implementation to show the difference between two strings (https://en.wikipedia.org/wiki/Levenshtein_distance)
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*
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*
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*/
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public class LevenshteinDistance{
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private static int minimum(int a, int b, int c){
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if(a < b && a < c){
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return a;
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}else if(b < a && b < c){
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return b;
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}else{
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return c;
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}
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}
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private static int calculate_distance(String a, String b){
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int len_a = a.length() + 1;
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int len_b = b.length() + 1;
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int [][] distance_mat = new int[len_a][len_b];
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for(int i = 0; i < len_a; i++){
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distance_mat[i][0] = i;
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}
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for(int j = 0; j < len_b; j++){
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distance_mat[0][j] = j;
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}
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for(int i = 0; i < len_a; i++){
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for(int j = 0; i < len_b; j++){
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int cost;
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if (a.charAt(i) == b.charAt(j)){
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cost = 0;
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}else{
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cost = 1;
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}
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distance_mat[i][j] = minimum(distance_mat[i-1][j], distance_mat[i-1][j-1], distance_mat[i][j-1]) + cost;
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}
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}
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return distance_mat[len_a-1][len_b-1];
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}
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public static void main(String [] args){
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String a = ""; // enter your string here
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String b = ""; // enter your string here
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System.out.print("Levenshtein distance between "+a + " and "+b+ " is: ");
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System.out.println(calculate_distance(a,b));
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}
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}
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