PR : DP problem Minimum Edit Distance in Java

Java/dynamic-programming/MinimumEditDistance.java

@@ -0,0 +1,30 @@
+public class MinimumEditDistance {
+    public static void main(String[] args) {
+        String str1 = "kitten";
+        String str2 = "sitting";
+        System.out.println("Minimum Edit Distance between \"" + str1 + "\" and \"" + str2 + "\" is: " + minEditDistance(str1, str2));
+    }
+
+    public static int minEditDistance(String str1, String str2) {
+        int m = str1.length();
+        int n = str2.length();
+        int[][] dp = new int[m + 1][n + 1];
+
+        for (int i = 0; i <= m; i++) {
+            for (int j = 0; j <= n; j++) {
+                if (i == 0) {
+                    dp[i][j] = j; // Insert all characters of str2
+                } else if (j == 0) {
+                    dp[i][j] = i; // Remove all characters of str1
+                } else if (str1.charAt(i - 1) == str2.charAt(j - 1)) {
+                    dp[i][j] = dp[i - 1][j - 1]; // Characters match
+                } else {
+                    dp[i][j] = 1 + Math.min(dp[i - 1][j], // Remove
+                                    Math.min(dp[i][j - 1], // Insert
+                                             dp[i - 1][j - 1])); // Replace
+                }
+            }
+        }
+        return dp[m][n];
+    }
+}