Add q47

Author: davidkun

src/ex/q047.clj

@@ -0,0 +1,5 @@
+;; https://4clojure.oxal.org/#/problem/047
+ 
+(ns ex.q047)
+
+(defn ans "Problem 47, Contain Yourself" [] 4)

test/ex/q047_test.clj

@@ -0,0 +1,12 @@
+;; https://4clojure.oxal.org/#/problem/047
+ 
+(ns ex.q047-test
+  (:require [clojure.test :as t]
+            [ex.q047 :as sut]))
+
+(t/deftest test-q47
+  (t/testing "Problem 47, Contain Yourself"
+    (t/is (contains? #{4 5 6} (sut/ans)))
+    (t/is (contains? [1 1 1 1 1] (sut/ans)))
+    (t/is (contains? {4 :a 2 :b} (sut/ans)))
+    (t/is (not (contains? [1 2 4] (sut/ans))))))