Data commit

Task/Numbers-with-equal-rises-and-falls/Java/numbers-with-equal-rises-and-falls.java

@@ -0,0 +1,29 @@
+public class EqualRisesFalls {
+    public static void main(String[] args) {
+        final int limit1 = 200;
+        final int limit2 = 10000000;
+        System.out.printf("The first %d numbers in the sequence are:\n", limit1);
+        int n = 0;
+        for (int count = 0; count < limit2; ) {
+            if (equalRisesAndFalls(++n)) {
+                ++count;
+                if (count <= limit1)
+                    System.out.printf("%3d%c", n, count % 20 == 0 ? '\n' : ' ');
+            }
+        }
+        System.out.printf("\nThe %dth number in the sequence is %d.\n", limit2, n);
+    }
+
+    private static boolean equalRisesAndFalls(int n) {
+        int total = 0;
+        for (int previousDigit = -1; n > 0; n /= 10) {
+            int digit = n % 10;
+            if (previousDigit > digit)
+                ++total;
+            else if (previousDigit >= 0 && previousDigit < digit)
+                --total;
+            previousDigit = digit;
+        }
+        return total == 0;
+    }
+}