edit distance

Author: gkcs

src/main/java/main/java/videos/EditDistance.java

@@ -0,0 +1,34 @@
+package main.java.videos;
+
+import java.util.stream.Stream;
+
+public class EditDistance {
+ public static int findEditDistance(final String a,
+ final String b,
+ final int cD,
+ final int cA,
+ final int cT) {
+ final int f[][] = new int[a.length() + 1][b.length() + 1];
+ for (int i = 1; i <= a.length(); i++) {
+ f[i][0] = cD * i;
+ }
+ for (int j = 1; j <= b.length(); j++) {
+ f[0][j] = cA * j;
+ }
+ for (int i = 1; i <= a.length(); i++) {
+ for (int j = 1; j <= b.length(); j++) {
+ final int transitionCost = a.charAt(i - 1) == b.charAt(j - 1) ? 0 : cT;
+ f[i][j] = Stream.of(f[i - 1][j] + cD, f[i][j - 1] + cA, f[i - 1][j - 1] + transitionCost)
+ .min(Integer::compareTo)
+ .orElse(Integer.MAX_VALUE);
+ }
+ }
+ return f[a.length()][b.length()];
+ }
+}
+
+class EditDistanceMain {
+ public static void main(String[] args) {
+ System.out.println("Edit Distance: " + EditDistance.findEditDistance("pqqrst", "qqttps", 1, 1, 1));
+ }
+}