diff --git a/01_pole.py b/01_pole.py
index 0ef2919..8804b15 100644
--- a/01_pole.py
+++ b/01_pole.py
@@ -9,11 +9,14 @@ def measure_time(operation, *args):
 
 def add_elements(array, elements):
     # TODO: Přidat všechny prvky z "elements" do pole "array"
-    pass
+    array.extend(elements)
 
 def find_elements(array, elements):
     # TODO: Najít všechny prvky z "elements" v poli "array"
-    pass
+    result = []
+    for el in elements:
+        result.append(el in array)
+    return result
 
 if __name__ == "__main__":
     array = []
diff --git a/02_hashmap_chaining.py b/02_hashmap_chaining.py
index fa3eba3..17a79d4 100644
--- a/02_hashmap_chaining.py
+++ b/02_hashmap_chaining.py
@@ -8,15 +8,24 @@ def __init__(self, size):
 
     def hash_function(self, key):
         # TODO: Implementovat hashovací funkci
-        pass
+        return hash(key) % self.size
 
     def add(self, key, value):
         # TODO: Přidat prvek s klíčem "key" a hodnotou "value" do hashmapy
-        pass
+        index = self.hash_function(key)
+        for i, (existing_key, _) in enumerate(self.table[index]):
+            if existing_key == key:
+                self.table[index][i] = (key, value)
+                return
+        self.table[index].append((key, value))
 
     def find(self, key):
         # TODO: Najít prvek s klíčem "key" v hashmapě a vrátit jeho hodnotu
-        pass
+        index = self.hash_function(key)
+        for existing_key, value in self.table[index]:
+            if existing_key == key:
+                return value
+        return None 
 
 def measure_time(operation, *args):
     start = time.time()
diff --git a/03_hashmap_open_addressing.py b/03_hashmap_open_addressing.py
index 95d0a4f..1686a6d 100644
--- a/03_hashmap_open_addressing.py
+++ b/03_hashmap_open_addressing.py
@@ -8,15 +8,28 @@ def __init__(self, size):
 
     def hash_function(self, key):
         # TODO: Implementovat hashovací funkci
-        pass
+        return hash(key) % self.size
 
     def add(self, key, value):
         # TODO: Přidat prvek s klíčem "key" a hodnotou "value" do hashmapy
-        pass
+        index = self.hash_function(key)
+        while self.table[index] is not None:
+            existing_key, _ = self.table[index]
+            if existing_key == key:
+                self.table[index] = (key, value)
+                return
+            index = (index + 1) % self.size
+        self.table[index] = (key, value)
 
     def find(self, key):
         # TODO: Najít prvek s klíčem "key" v hashmapě a vrátit jeho hodnotu
-        pass
+        index = self.hash_function(key)
+        while self.table[index] is not True:
+            existing_key, value = self.table[index]
+            if existing_key == key:
+                return value
+            index = (index + 1) % self.size
+        return None
 
 def measure_time(operation, *args):
     start = time.time()
diff --git a/04_built_in_hashmap.py b/04_built_in_hashmap.py
index 2fd4f10..336b227 100644
--- a/04_built_in_hashmap.py
+++ b/04_built_in_hashmap.py
@@ -9,11 +9,12 @@ def measure_time(operation, *args):
 
 def add_elements(hash_map, keys, values):
     # TODO: Přidat všechny klíče a hodnoty do hashmapy
-    pass
+    for key, value in zip(keys, values):
+        hash_map[key] = value
 
 def find_elements(hash_map, keys):
     # TODO: Najít všechny klíče v hashmapě
-    pass
+    return [hash_map.get(key, None) for key in keys]
 
 if __name__ == "__main__":
     hash_map = {}