Initial data commit

Task/Damm-algorithm/Groovy/damm-algorithm.groovy

@@ -0,0 +1,32 @@
+class DammAlgorithm {
+    private static final int[][] TABLE = [
+        [0, 3, 1, 7, 5, 9, 8, 6, 4, 2],
+        [7, 0, 9, 2, 1, 5, 4, 8, 6, 3],
+        [4, 2, 0, 6, 8, 7, 1, 3, 5, 9],
+        [1, 7, 5, 0, 9, 8, 3, 4, 2, 6],
+        [6, 1, 2, 3, 0, 4, 5, 9, 7, 8],
+        [3, 6, 7, 4, 2, 0, 9, 5, 8, 1],
+        [5, 8, 6, 9, 7, 2, 0, 1, 3, 4],
+        [8, 9, 4, 5, 3, 6, 2, 0, 1, 7],
+        [9, 4, 3, 8, 6, 1, 7, 2, 0, 5],
+        [2, 5, 8, 1, 4, 3, 6, 7, 9, 0],
+    ]
+
+    private static boolean damm(String s) {
+        int interim = 0
+        for (char c : s.toCharArray()) interim = TABLE[interim][c - ('0' as Character)]
+        return interim == 0
+    }
+
+    static void main(String[] args) {
+        int[] numbers = [5724, 5727, 112946, 112949]
+        for (Integer number : numbers) {
+            boolean isValid = damm(number.toString())
+            if (isValid) {
+                System.out.printf("%6d is valid\n", number)
+            } else {
+                System.out.printf("%6d is invalid\n", number)
+            }
+        }
+    }
+}