diff --git a/01-Introduction/index.py b/01-Introduction/index.py
index 9e85259..b3b85f7 100644
--- a/01-Introduction/index.py
+++ b/01-Introduction/index.py
@@ -42,10 +42,8 @@
 
 # Not memoized
 def fibo(n):
-	if n == 0:
-		return 0
-	if n == 1:
-		return 1
+	if n < 2:
+		return n;
 	return fibo(n-1) + fibo(n-2)
 
 print(fibo(10))
diff --git a/03-Sorting/index3.py b/03-Sorting/index3.py
index f36048f..d2fbbf6 100644
--- a/03-Sorting/index3.py
+++ b/03-Sorting/index3.py
@@ -22,6 +22,8 @@
 
 
 def binary_search(arr, elem, prim_index=0):
+    if len(arr) < 2:
+        return -1
     mid = int(len(arr) / 2)
     mid_elem = arr[mid]
     if mid_elem == elem: