Bonus challenge for week 4

Week4Bonus.java

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+/**
+ * In this week's club bonus challenge, you will be tasked with solving grid traversal problem.
+ */
+public class Week4 {
+
+    /**
+     * In a 2x2 grid, there are exactly 6 routes from the top-left corner to the bottom-right corner.
+     * Find an algorithm to find the number of routes in a 20x20 grid.
+     *
+     * Credit: Project Euler Problem 15.
+     *
+     * HINT: Recursion, recursion, recursion, recursion, recursion, recursion, recursion, recursion, recursion, recursion...
+     */
+    public static long problem1() {
+        return -1; // TODO
+    }
+
+    /**
+     * Test driver should not be edited!
+     */
+    public static void main(String[] args) {
+        long ans1 = problem1();
+
+        System.out.println(ans1 == 137846528820 ? "Problem 1 is correct!" : "Problem 1 (" + ans1 + ") is not correct...");
+    }
+}