correction

Author: pathywang

Sprint-2/improve_with_caches/fibonacci/fibonacci.py

@@ -1,4 +1,11 @@
+cache = {
+    0: 0,
+    1: 1
+}
+
 def fibonacci(n):
-    if n <= 1:
-        return n
-    return fibonacci(n - 1) + fibonacci(n - 2)
+    if n in cache:
+        return cache[n]
+
+    cache[n] = fibonacci(n - 1) + fibonacci(n - 2)
+    return cache[n]