Data commit

Task/CUSIP/Groovy/cusip.groovy

@@ -0,0 +1,40 @@
+class Cusip {
+    private static Boolean isCusip(String s) {
+        if (s.length() != 9) return false
+        int sum = 0
+        for (int i = 0; i <= 7; i++) {
+            char c = s.charAt(i)
+
+            int v
+            if (c >= ('0' as char) && c <= ('9' as char)) {
+                v = c - 48
+            } else if (c >= ('A' as char) && c <= ('Z' as char)) {
+                v = c - 55  // lower case letters apparently invalid
+            } else if (c == '*' as char) {
+                v = 36
+            } else if (c == '@' as char) {
+                v = 37
+            } else if (c == '#' as char) {
+                v = 38
+            } else {
+                return false
+            }
+            if (i % 2 == 1) v *= 2  // check if odd as using 0-based indexing
+            sum += v / 10 + v % 10
+        }
+        return s.charAt(8) - 48 == (10 - (sum % 10)) % 10
+    }
+
+    static void main(String[] args) {
+        List<String> candidates=new ArrayList<>()
+        candidates.add("037833100")
+        candidates.add("17275R102")
+        candidates.add("38259P508")
+        candidates.add("594918104")
+        candidates.add("68389X106")
+        candidates.add("68389X105")
+        for (String candidate : candidates) {
+            System.out.printf("%s -> %s%n", candidate, isCusip(candidate) ? "correct" : "incorrect")
+        }
+    }
+}