diff --git a/TinySTL/Algorithm.h b/TinySTL/Algorithm.h
index 1007f85..72c4a48 100644
--- a/TinySTL/Algorithm.h
+++ b/TinySTL/Algorithm.h
@@ -7,6 +7,7 @@
 #include "TypeTraits.h"
 
 #include <cstring>
+#include <utility>
 
 namespace TinySTL{
 	//********* [fill] ********************
@@ -345,6 +346,27 @@ namespace TinySTL{
 		}
 		return n;
 	}
+	//********** [mismatch] ******************************
+	//********* [Algorithm Complexity: O(N)] ****************
+	template <class InputIterator1, class InputIterator2>
+	std::pair<InputIterator1, InputIterator2>
+		mismatch(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2){
+			for (; first1 != last1; ++first1, ++first2){
+				if (*first1 != *first2)
+					break;
+			}
+			return std::make_pair(first1, first2);
+	}
+	template <class InputIterator1, class InputIterator2, class BinaryPredicate>
+	std::pair<InputIterator1, InputIterator2>
+		mismatch(InputIterator1 first1, InputIterator1 last1,
+		InputIterator2 first2, BinaryPredicate pred){
+		for (; first1 != last1; ++first1, ++first2){
+			if (!pred(*first1, *first2))
+				break;
+		}
+		return std::make_pair(first1, first2);
+	}
 }