diff --git a/Hungarian.cpp b/Hungarian.cpp
index deb4f71..bd48982 100644
--- a/Hungarian.cpp
+++ b/Hungarian.cpp
@@ -14,6 +14,7 @@
 #include <cmath>  // for fabs()
 #include "Hungarian.h"
 
+using namespace std;
 
 HungarianAlgorithm::HungarianAlgorithm(){}
 HungarianAlgorithm::~HungarianAlgorithm(){}
diff --git a/Hungarian.h b/Hungarian.h
index eeb7065..280dd6b 100644
--- a/Hungarian.h
+++ b/Hungarian.h
@@ -15,7 +15,6 @@
 #include <iostream>
 #include <vector>
 
-using namespace std;
 
 
 class HungarianAlgorithm
@@ -23,7 +22,7 @@ class HungarianAlgorithm
 public:
 	HungarianAlgorithm();
 	~HungarianAlgorithm();
-	double Solve(vector <vector<double> >& DistMatrix, vector<int>& Assignment);
+	double Solve(std::vector <std::vector<double> >& DistMatrix, std::vector<int>& Assignment);
 
 private:
 	void assignmentoptimal(int *assignment, double *cost, double *distMatrix, int nOfRows, int nOfColumns);
diff --git a/testMain.cpp b/testMain.cpp
index 139e134..98987c1 100644
--- a/testMain.cpp
+++ b/testMain.cpp
@@ -1,6 +1,6 @@
 #include <iostream>
 #include "Hungarian.h"
-
+using namespace std;
 
 int main(void)
 {