Added Algoexpert

Author: rimijoker

Diff for: Algoexpert/Easy/Fibonacci Number.py

@@ -0,0 +1,12 @@
+class Solution:
+    def fib(self, N: int) -> int:
+        if N <= 1:
+            return N
+        self.cache = {0: 0, 1: 1}
+        return self.memoize(N)
+
+    def memoize(self, N: int) -> {}:
+        if N in self.cache.keys():
+            return self.cache[N]
+        self.cache[N] = self.memoize(N-1) + self.memoize(N-2)
+        return self.memoize(N)