Merge pull request #271 from juhig/master

EditDistance DP Code Added

Author: pratyushmp

Java/EditDistance.java

@@ -0,0 +1,73 @@
+package selfdp;
+
+public class editdistance {
+	public static int editdr(String s1, String s2) {
+		if (Math.min(s1.length(), s2.length()) == 0)
+			return Math.max(s1.length(), s2.length());
+		char ch1 = s1.charAt(0);
+		char ch2 = s2.charAt(0);
+		String ros1 = s1.substring(1);
+		String ros2 = s2.substring(1);
+		if (ch1 == ch2)
+			return editdr(ros1, ros2);
+		else {
+			int a = editdr(s1, ros2);// d
+			int b = editdr(ros1, s2);// i
+			int c = editdr(ros1, ros2);// r
+			int r = Math.min(Math.min(a, b), c) + 1;
+			//System.out.println(r);
+			return r;
+
+		}
+
+	}
+
+	static String x;
+	static String y;
+
+	public static int editdTD(String s1, String s2, int strg[][]) {
+
+		if (Math.min(s1.length(), s2.length()) == 0) {
+			return Math.max(s1.length(), s2.length());
+		}
+
+		char ch1 = s1.charAt(0);
+		char ch2 = s2.charAt(0);
+		String ros1 = s1.substring(1);
+		String ros2 = s2.substring(1);
+		int si1 = x.indexOf(ch1);
+		int si2 = y.indexOf(ch2);
+	//	System.out.println(ch1+" "+si1);
+
+		if (strg[si1][si2] != 0) {
+		//	 System.out.println("hi");
+			return strg[si1][si2];
+		}
+
+		if (ch1 == ch2) {
+
+			return editdTD(ros1, ros2, strg);
+		} else {
+			int a = editdTD(s1, ros2, strg);// d
+			int b = editdTD(ros1, s2, strg);// i
+			int c = editdTD(ros1, ros2, strg);// r
+			int r = Math.min(Math.min(a, b), c) + 1;
+			strg[si1][si2] = r;
+			//System.out.println(r);
+
+			return r;
+		}
+
+	}
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		x = "sundayfkl";
+		y = "saturdayjuhi";
+		System.out.println(editdr(x, y));
+		System.out.println("-------------");
+		System.out.println(editdTD(x, y, new int[x.length()][y.length()]));
+
+	}
+
+}