Update algorithms/dynamic_programming/climb_stairs/__init__.py

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: BrianLusina

algorithms/dynamic_programming/climb_stairs/__init__.py

@@ -14,7 +14,9 @@ def climb_stairs(n: int) -> int:
 
 
 def climb_stairs_dp_bottom_up(n: int) -> int:
-    if n == 1:
+    if n < 0:
+        return 0
+    if n <= 1:
         return 1
 
     dp = [0] * (n + 1)