diff --git a/high_performance_operators/gemm/version1.cpp b/high_performance_operators/gemm/version1.cpp
index e650d3d..2b9a068 100644
--- a/high_performance_operators/gemm/version1.cpp
+++ b/high_performance_operators/gemm/version1.cpp
@@ -9,33 +9,58 @@
 
 template<class type>
 struct matrix_2d {
-    matrix_2d(std::vector<std::vector<type>> &data) {
-        this->data = data;
-        h = data.size();
-        w = data[0].size();
+
+public:
+    matrix_2d(std::vector<std::vector<type>> data) {
+      h = data.size();
+      w = data[0].size();
+      stride[0] = w;
+      stride[1] = 1;
+      
+      this->data = new type[h * w];
+      for (int i = 0; i < h; ++i) {
+        for (int j = 0; j < w; ++j) {
+          (this->data)[i * stride[0] + j * stride[1]] = data[i][j];  
+        }
+      }
     }
 
     matrix_2d(int high, int width, type fill = 0) {
-        data.resize(high, std::vector<type>(width, fill));
-        h = high;
-        w = width;
+      h = high;
+      w = width;
+      stride[0] = w;
+      stride[1] = 1;
+
+      this->data = new type[h * w];
+      std::fill(this->data, this->data + h * w, fill);
+    }
+
+    ~matrix_2d() {
+      delete data;
     }
 
-    std::vector<type> & operator[](int i) {
-        return data[i];
+    type * data_ptr() {
+      return data;
+    }
+
+    type * operator[](int i) {
+      return (this->data) + i * stride[0];
     }
 
     friend std::ostream & operator<<(std::ostream & o, matrix_2d<type> & m) {
-        for (int i = 0; i < m.h; ++i) {
-            for (int j = 0; j < m.w; ++j) o << m[i][j] << " ";
-            o << std::endl;
-        }
-        return o;
+      for (int i = 0; i < m.h; ++i) {
+          for (int j = 0; j < m.w; ++j) o << m[i][j] << " ";
+          o << std::endl;
+      }
+      return o;
     }
 
     int h;
     int w;
-    std::vector<std::vector<type>> data;
+
+private:
+    int stride[2];
+    type * data;
 };
 
 template<class type>