From 37f7aa25ffca20c5c3ad0d36f7aeb9b823b599de Mon Sep 17 00:00:00 2001
From: Marege <dutk.nazar@gmail.com>
Date: Tue, 29 Sep 2026 18:24:38 +0200
Subject: [PATCH] Fix2

---
 u2/list_ops.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/u2/list_ops.py b/u2/list_ops.py
index b67ac83..0cb3b6c 100644
--- a/u2/list_ops.py
+++ b/u2/list_ops.py
@@ -9,8 +9,11 @@ def append(list1, list2):
 
 def concat(lists):
     result = []
+    if lists == []:
+        return []
     for i in lists:
-        result += i
+        if i != []:
+            result += i
         return result
     """Spojí zoznamy obsiahnuté v lists do jedného zoznamu.
     Sploštenie sa vykoná iba na jednej úrovni; vnorené zoznamy sa ďalej nesplošťujú."""
@@ -40,6 +43,8 @@ def length(seq):
 
 def map(function, seq):
     result = []
+    if seq == []:
+        return []
     for i in seq:
         a  = function(seq[i])
         result.append(a)