Create editDistance.java

editDistance.java

@@ -0,0 +1,64 @@
+package string;
+
+public class editDistance {
+    static void EditDistDP(String str1, String str2) {
+        int len1 = str1.length();
+        int len2 = str2.length();
+
+        // Create a DP array to memoize result
+        // of previous computations
+        int[][] DP = new int[2][len1 + 1];
+
+        // Base condition when second String
+        // is empty then we remove all characters
+        for (int i = 0; i <= len1; i++)
+            DP[0][i] = i;
+
+        // Start filling the DP
+        // This loop run for every
+        // character in second String
+        for (int i = 1; i <= len2; i++) {
+
+            // This loop compares the char from
+            // second String with first String
+            // characters
+            for (int j = 0; j <= len1; j++) {
+
+                // if first String is empty then
+                // we have to perform add character
+                // operation to get second String
+                if (j == 0)
+                    DP[i % 2][j] = i;
+
+                // if character from both String
+                // is same then we do not perform any
+                // operation . here i % 2 is for bound
+                // the row number.
+                else if (str1.charAt(j - 1) == str2.charAt(i - 1)) {
+                    DP[i % 2][j] = DP[(i - 1) % 2][j - 1];
+                }
+
+                // if character from both String is
+                // not same then we take the minimum
+                // from three specified operation
+                else {
+                    DP[i % 2][j] = 1 + Math.min(DP[(i - 1) % 2][j], Math.min(DP[i % 2][j - 1], DP[(i - 1) % 2][j - 1]));
+                }
+            }
+        }
+
+        // after complete fill the DP array
+        // if the len2 is even then we end
+        // up in the 0th row else we end up
+        // in the 1th row so we take len2 % 2
+        // to get row
+        System.out.print(DP[len2 % 2][len1] + "\n");
+    }
+
+    // Driver program
+    public static void main(String[] args) {
+        String str1 = "food";
+        String str2 = "money";
+        EditDistDP(str1, str2);
+    }
+}