diff --git a/01_pole.py b/01_pole.py
index 0ef2919..06a23b7 100644
--- a/01_pole.py
+++ b/01_pole.py
@@ -8,12 +8,13 @@ def measure_time(operation, *args):
     return result, end - start
 
 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
+    results = []
+    for el in elements:
+        results.append(el in array)
+    return results
 
 if __name__ == "__main__":
     array = []
diff --git a/02_hashmap_chaining.py b/02_hashmap_chaining.py
index fa3eba3..7878b43 100644
--- a/02_hashmap_chaining.py
+++ b/02_hashmap_chaining.py
@@ -7,17 +7,21 @@ def __init__(self, size):
         self.table = [[] for _ in range(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, (k, v) in enumerate(self.table[index]):
+            if k == key:
+                self.table[index][i] = (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 k, v in self.table[index]:
+            if k == key:
+                return v  
+        return None 
+    
 def measure_time(operation, *args):
     start = time.time()
     result = operation(*args)
diff --git a/03_hashmap_open_addressing.py b/03_hashmap_open_addressing.py
index 95d0a4f..e194913 100644
--- a/03_hashmap_open_addressing.py
+++ b/03_hashmap_open_addressing.py
@@ -7,16 +7,29 @@ def __init__(self, size):
         self.table = [None] * 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 _ in range(self.size):
+            if self.table[index] is None or self.table[index]:
+                self.table[index] = (key, value)
+                return
+            elif self.table[index][0] == key:
+                self.table[index] = (key, value)
+                return
+            index = (index + 1) % self.size
 
     def find(self, key):
-        # TODO: Najít prvek s klíčem "key" v hashmapě a vrátit jeho hodnotu
-        pass
+        index = self.hash_function(key)
+        for _ in range(self.size):
+            if self.table[index] is None:
+                return None
+            if self.table[index] and self.table[index][0] == key:
+                return self.table[index][1]
+            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..2f7fd6b 100644
--- a/04_built_in_hashmap.py
+++ b/04_built_in_hashmap.py
@@ -8,12 +8,11 @@ def measure_time(operation, *args):
     return result, end - start
 
 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 {key: hash_map.get(key) for key in keys}
 
 if __name__ == "__main__":
     hash_map = {}