Data commit

Task/Straddling-checkerboard/Java/straddling-checkerboard.java

@@ -0,0 +1,48 @@
+import java.util.HashMap;
+import java.util.Map;
+import java.util.regex.*;
+
+public class StraddlingCheckerboard {
+
+    final static String[] keyvals = {"H:0", "O:1", "L:2", "M:4", "E:5", "S:6",
+        "R:8", "T:9", "A:30", "B:31", "C:32", "D:33", "F:34", "G:35", "I:36",
+        "J:37", "K:38", "N:39", "P:70", "Q:71", "U:72", "V:73", "W:74", "X:75",
+        "Y:76", "Z:77", ".:78", "/:79", "0:790", "1:791", "2:792", "3:793",
+        "4:794", "5:795", "6:796", "7:797", "8:798", "9:799"};
+
+    final static Map<String, String> val2key = new HashMap<>();
+    final static Map<String, String> key2val = new HashMap<>();
+
+    public static void main(String[] args) {
+        for (String keyval : keyvals) {
+            String[] kv = keyval.split(":");
+            val2key.put(kv[0], kv[1]);
+            key2val.put(kv[1], kv[0]);
+        }
+        String enc = encode("One night-it was on the twentieth of March, "
+                + "1888-I was returning");
+        System.out.println(enc);
+        System.out.println(decode(enc));
+    }
+
+    static String encode(String s) {
+        StringBuilder sb = new StringBuilder();
+        for (String c : s.toUpperCase().split("")) {
+            c = val2key.get(c);
+            if (c != null)
+                sb.append(c);
+        }
+        return sb.toString();
+    }
+
+    static String decode(String s) {
+        Matcher m = Pattern.compile("(79.|3.|7.|.)").matcher(s);
+        StringBuilder sb = new StringBuilder();
+        while (m.find()) {
+            String v = key2val.get(m.group(1));
+            if (v != null)
+                sb.append(v);
+        }
+        return sb.toString();
+    }
+}