Data commit

Task/Gapful-numbers/Java/gapful-numbers.java

@@ -0,0 +1,38 @@
+import java.util.List;
+
+public class GapfulNumbers {
+    private static String commatize(long n) {
+        StringBuilder sb = new StringBuilder(Long.toString(n));
+        int le = sb.length();
+        for (int i = le - 3; i >= 1; i -= 3) {
+            sb.insert(i, ',');
+        }
+        return sb.toString();
+    }
+
+    public static void main(String[] args) {
+        List<Long> starts = List.of((long) 1e2, (long) 1e6, (long) 1e7, (long) 1e9, (long) 7123);
+        List<Integer> counts = List.of(30, 15, 15, 10, 25);
+        for (int i = 0; i < starts.size(); ++i) {
+            int count = 0;
+            Long j = starts.get(i);
+            long pow = 100;
+            while (j >= pow * 10) {
+                pow *= 10;
+            }
+            System.out.printf("First %d gapful numbers starting at %s:\n", counts.get(i), commatize(starts.get(i)));
+            while (count < counts.get(i)) {
+                long fl = (j / pow) * 10 + (j % 10);
+                if (j % fl == 0) {
+                    System.out.printf("%d ", j);
+                    count++;
+                }
+                j++;
+                if (j >= 10 * pow) {
+                    pow *= 10;
+                }
+            }
+            System.out.println('\n');
+        }
+    }
+}