diff --git a/Kernel/include_std/algorithm b/Kernel/include_std/algorithm
index f6028bc1..48c67276 100644
--- a/Kernel/include_std/algorithm
+++ b/Kernel/include_std/algorithm
@@ -362,4 +362,22 @@ namespace std
 
 	template <class ExecutionPolicy, class RandomIt, class Compare>
 	void sort(ExecutionPolicy &&policy, RandomIt first, RandomIt last, Compare comp);
+
+	template <class InputIt1, class InputIt2>
+	constexpr bool lexicographical_compare(InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2);
+
+	template <class ExecutionPolicy, class ForwardIt1, class ForwardIt2>
+	bool lexicographical_compare(ExecutionPolicy &&policy, ForwardIt1 first1, ForwardIt1 last1, ForwardIt2 first2, ForwardIt2 last2);
+
+	template <class InputIt1, class InputIt2, class Compare>
+	constexpr bool lexicographical_compare(InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2, Compare comp);
+
+	template <class ExecutionPolicy, class ForwardIt1, class ForwardIt2, class Compare>
+	bool lexicographical_compare(ExecutionPolicy &&policy, ForwardIt1 first1, ForwardIt1 last1, ForwardIt2 first2, ForwardIt2 last2, Compare comp);
+
+	template <class InputIt1, class InputIt2, class Cmp>
+	constexpr auto lexicographical_compare_three_way(InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2, Cmp comp) -> decltype(comp(*first1, *first2));
+
+	template <class InputIt1, class InputIt2>
+	constexpr auto lexicographical_compare_three_way(InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2);
 }