diff --git a/ex02/src/PmergeMe.hpp b/ex02/src/PmergeMe.hpp
index 548d7c9..8143838 100644
--- a/ex02/src/PmergeMe.hpp
+++ b/ex02/src/PmergeMe.hpp
@@ -2,6 +2,7 @@
 
 #include <algorithm>
 #include <cstddef>
+#include <cstring>
 #include <iostream>
 #include <utility>
 #include <vector>
@@ -14,14 +15,13 @@ std::pair<int, int>* create_pairs(const T& array, size_t len)
 {
 	std::pair<int, int>* pairs = new std::pair<int, int>[len];
 
+	pairs[len - 1].second = -1;
 	for (size_t i = 0; i < len; i++)
 	{
-		pairs[i].second = array[i * 2];
+		pairs[i].first = array[i * 2];
 		if (array.size() > i * 2 + 1)
-			pairs[i].first = array[i * 2 + 1];
+			pairs[i].second = array[i * 2 + 1];
 	}
-	if (len % 2)
-		pairs[len - 1].first = pairs[len - 1].second;
 	return pairs;
 }
 
diff --git a/ex02/src/main.cpp b/ex02/src/main.cpp
index 6f01395..6bf7b59 100644
--- a/ex02/src/main.cpp
+++ b/ex02/src/main.cpp
@@ -3,6 +3,7 @@
 #include <cctype>
 #include <cstddef>
 #include <cstdlib>
+#include <string>
 #include <time.h> 
 #include <deque>
 #include <iostream>
@@ -12,7 +13,72 @@ template<typename T>
 void display(const T& array)
 {
 	for (size_t i = 0; i != array.size(); i++)
-		std::cout << array[i] << " ";
+		if (array[i] != -1)
+			std::cout << array[i] << " ";
+}
+
+template <typename T>
+int parsing_arg(const char* str, T& array)
+{
+	int number = -1;
+	for (size_t i = 0; true; i++)
+	{
+		if (std::isdigit(str[i]))
+		{
+			if (number == -1)
+				number = 0;
+			number = number * 10 + str[i] - '0';
+		}
+		else if (str[i] == '\0' || str[i] == ' ')
+		{
+			if (number != -1)
+			{
+				array.push_back(number);
+				number = -1;
+			}
+			if (str[i] == '\0')
+				return 0;
+		}
+		else
+		{
+			std::cout << "Error: " << str[i] << i << " invalid character." << std::endl;
+			return 1;
+		}
+	}
+}
+
+template <typename T>
+int parsing_args(const char* const * args, size_t len, T& array)
+{
+	for (size_t i = 0; i != len; i++)
+	{
+		if (parsing_arg(args[i], array))
+			return 1;
+	}
+	return 0;
+}
+
+template <typename T>
+int parsing_duplicate(T& array)
+{
+	for (size_t i = 0; i + 1 != array.size(); i++)
+	{
+		for (size_t j = i + 1; j != array.size(); j++)
+		{
+			if (array[i] == array[j])
+			{
+				std::cout << "Error: " << array[i] << " is duplicated." << std::endl;
+				return 1;
+			}
+		}
+	}
+	return 0;
+}
+
+template <typename T>
+int parsing(const char* const* args, size_t len, T& array)
+{
+	return parsing_args(args, len, array) || parsing_duplicate(array);
 }
 
 int main(int ac, char** av)
@@ -20,21 +86,8 @@ int main(int ac, char** av)
 	{
 		std::vector<int> array;
 
-		for (int i = 1; i != ac; i++)
-		{
-			for (int j = 0; av[i][j] != '\0'; j++)
-			{
-				if (j == 0 || av[i][j] == ' ')
-					array.push_back(atoi(av[i] + j + (j != 0)));
-				if (!std::isdigit(av[i][j]) and av[i][j] != ' ')
-				{
-					std::cout << "Error" << std::endl;
-					return 1;
-				}
-			}
-		}
-		if (array.size() > 0)
-			array.pop_back();
+		if (parsing(av + 1, (size_t) ac - 1, array))
+			return 1;
 
 		std::cout << "Before: ";
 		display(array);
@@ -54,28 +107,15 @@ int main(int ac, char** av)
 	{
 		std::deque<int> array;
 
-		for (int i = 1; i != ac; i++)
-		{
-			for (int j = 0; av[i][j] != '\0'; j++)
-			{
-				if (j == 0 || av[i][j] == ' ')
-					array.push_back(atoi(av[i] + j + (j != 0)));
-				else if (!std::isdigit(av[i][j]))
-				{
-					std::cout << "Error" << std::endl;
-					return 1;
-				}
-			}
-		}
-		if (array.size() > 0)
-			array.pop_back();
+		if (parsing(av + 1, (size_t) ac - 1, array))
+			return 1;
 
-		const clock_t time_deque_start = clock();
+		const clock_t time_vec_start = clock();
 		
 		PmergeMe(array);
 		
-		const clock_t time_deque_stop = clock();
-
-		std::cout << "Time to process a range of " << array.size() <<" elements with std::vector : " << ((double) (time_deque_stop - time_deque_start) / CLOCKS_PER_SEC) * 1000000 << " us" << std::endl;
+		const clock_t time_vec_stop = clock();
+		
+		std::cout << "Time to process a range of " << array.size() <<" elements with std::vector : " << ((double) (time_vec_stop - time_vec_start) / CLOCKS_PER_SEC) * 1000000 << " us" << std::endl;
 	}
 }
\ No newline at end of file