diff --git a/TinySTL/Detail/Unordered_set.impl.h b/TinySTL/Detail/Unordered_set.impl.h
index 1ba76e5..4e700f1 100644
--- a/TinySTL/Detail/Unordered_set.impl.h
+++ b/TinySTL/Detail/Unordered_set.impl.h
@@ -173,6 +173,70 @@ namespace TinySTL{
 		Unordered_set<Key, Hash, KeyEqual, Allocator>::end(){
 		return iterator(buckets_.size() - 1, buckets_[buckets_.size() - 1].end(), this);
 	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::local_iterator 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::begin(size_type i){
+		return buckets_[i].begin();
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::local_iterator 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::end(size_type i){
+		return buckets_[i].end();
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::iterator 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::find(const key_type& key){
+		auto index = bucket_index(key);
+		for (auto it = begin(index); it != end(index); ++it){
+			if (key_equal()(key, *it))
+				return iterator(index, it, this);
+		}
+		return end();
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::size_type 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::count(const key_type& key){
+		auto it = find(key);
+		return it == end() ? 0 : 1;
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	TinySTL::pair<typename Unordered_set<Key, Hash, KeyEqual, Allocator>::iterator, bool> 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::insert(const value_type& val){
+		if (!has_key(val)){
+			auto index = bucket_index(val);
+			buckets_[index].push_front(val);
+			++size_;
+			return TinySTL::pair<iterator, bool>(iterator(index, buckets_[index].begin(), this), true);
+		}
+		return TinySTL::pair<iterator, bool>(end(), false);
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	template<class InputIterator>
+	void Unordered_set<Key, Hash, KeyEqual, Allocator>::insert(InputIterator first, InputIterator last){
+		for (; first != last; ++first){
+			insert(*first);
+		}
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::iterator 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::erase(iterator position){
+		--size_;
+		auto t = position++;
+		auto index = t.bucket_index_;
+		auto it = buckets_[index].erase(t.iterator_);
+		return position;
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::size_type 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::erase(const key_type& key){
+		auto it = find(key);
+		if (it == end()){
+			return 0;
+		}else{
+			erase(it);
+			return 1;
+		}
+	}
 }
 
 #endif
\ No newline at end of file
diff --git a/TinySTL/Unordered_set.h b/TinySTL/Unordered_set.h
index 151b516..1a35418 100644
--- a/TinySTL/Unordered_set.h
+++ b/TinySTL/Unordered_set.h
@@ -14,6 +14,9 @@ namespace TinySTL{
 		template<class Key, class ListIterator, class Hash = std::hash<Key>,
 		class KeyEqual = TinySTL::equal_to<Key>, class Allocator = TinySTL::allocator < Key >>
 		class ust_iterator{
+		private:
+			template<class Key, class Hash, class KeyEqual, class Allocator>
+			friend class Unordered_set;
 		private:
 			typedef Unordered_set<Key, Hash, KeyEqual, Allocator>* cntrPtr;
 			size_t bucket_index_;
@@ -51,6 +54,7 @@ namespace TinySTL{
 		typedef Allocator allocator_type;
 		typedef value_type& reference;
 		typedef const value_type& const_reference;
+		typedef typename TinySTL::list<key_type>::iterator local_iterator;
 		typedef Detail::ust_iterator<Key, typename TinySTL::list<key_type>::iterator, Hash, KeyEqual, Allocator> iterator;
 	private:
 		TinySTL::vector<TinySTL::list<key_type>> buckets_;
@@ -73,6 +77,17 @@ namespace TinySTL{
 
 		iterator begin();
 		iterator end();
+		local_iterator begin(size_type i);
+		local_iterator end(size_type i);
+
+		iterator find(const key_type& key);
+		size_type count(const key_type& key);
+
+		TinySTL::pair<iterator, bool> insert(const value_type& val);
+		template<class InputIterator>
+		void insert(InputIterator first, InputIterator last);
+		iterator erase(iterator position);
+		size_type erase(const key_type& key);
 
 		haser hash_function()const;
 		key_equal key_eq()const;