Edit distance
import java.util.*;
public class EditDistance {
public static void Print(int dp[][]) {
for (int i = 0; i < dp.length; i++) {
for (int j = 0; j < dp[0].length; j++) {
System.out.print(dp[i][j] + " ");
}
System.out.println();
}
System.out.println();
}
public static int MinOPerations(String str1, String str2) {
int n = str1.length();
int m = str2.length();
int dp[][] = new int[n + 1][m + 1];
for (int i = 0; i < n + 1; i++) {
for (int j = 0; j < m + 1; j++) {
if (i == 0) {
dp[0][j] = j;
} else if (j == 0) {
dp[i][0] = i;
}
}
}
for (int i = 1; i < n + 1; i++) {
for (int j = 1; j < m + 1; j++) {
// CHARACTERS ARE SAME
if (str1.charAt(i - 1) == str2.charAt(j - 1)) {
// NO ACTION
dp[i][j] = dp[i - 1][j - 1];
}
// CHARACTERS ARE DIFFERENT
else {
int add = dp[i][j - 1] + 1; // here'1' REFERS TO OPERATION COUN
int del = dp[i - 1][j] + 1;
int replace = dp[i - 1][j - 1] + 1;
dp[i][j] = Math.min(Math.max(add, del), replace);
}
}
}
Print(dp);
return dp[n][m];
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter string1:");
String str1 = sc.nextLine();
System.out.println("Enter string 2:");
String str2 = sc.nextLine();
System.out.println("The minimum number of operations required to convert string 1 to string 2:"
+ MinOPerations(str1, str2));
}
}
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