diff --git a/librerie/exercise5/matrix/csr/matrixcsr.cpp b/librerie/exercise5/matrix/csr/matrixcsr.cpp
index d374ceb..9a91c0c 100644
--- a/librerie/exercise5/matrix/csr/matrixcsr.cpp
+++ b/librerie/exercise5/matrix/csr/matrixcsr.cpp
@@ -3,7 +3,95 @@ namespace lasd {
 
 /* ************************************************************************** */
 
-// ...
+template <typename Data>
+MatrixCSR<Data>::MatrixCSR(){
+  R[0] = &head;
+}
+
+template <typename Data>
+MatrixCSR<Data>::MatrixCSR(const ulong& r, const ulong& c){
+  rows = r;
+  columns = c;
+  R.Resize(rows+1);
+  for(ulong i=0 ; i<R.Size() ; ++i){
+    R[i] = &head;
+  }
+}
+
+// copy constructor
+template <typename Data>
+MatrixCSR<Data>::MatrixCSR(const MatrixCSR& toCopy) : MatrixCSR(toCopy.rows, toCopy.columns) {
+  /*
+    For each element in the "R" vector, insert it in the matrix (represented as a list)
+    in this way:
+    The row index is represented by "i" (the variable that iterates over the R array),
+    meanwhile the column index is represented by the second element in the pair of the node.
+    The actual element is stored in the first element in the pair of the node.
+    The update of the newely created R array is left to operator()().
+  */
+  for(ulong i=0 ; i < (toCopy.R.Size()-1) ; ++i){
+    for(Node** ptr = toCopy.R[i] ; ptr!=toCopy.R[i+1] ; ptr = &( (*(*ptr)).next ) ){
+      (*this)(i , ((*ptr)->value).second) = (*ptr)->value).first;
+    }
+  }
+}
+
+template <typename Data>
+MatrixCSR<Data>::MatrixCSR(MatrixCSR&& toMove) : MatrixCSR() noexcept{ // controllare se chiamare MatrixCSR()
+  std::swap(rows, toMove.rows);
+  std::swap(columns, toMove.columns);
+  std::swap(size, toMove.size);
+  std::swap(head, toMove.head);
+  std::swap(R, toMove.R);
+
+  toMove.R[0] = &toMove.head;
+
+  Node** oldHead = R[0];
+  for(ulong i=0 ; i<R.Size() && R[i]==oldHead; ++i){
+    R[i] = &head;
+  }
+}
+
+template <typename Data>
+MatrixCSR<Data>::~MatrixCSR(){
+  Clear();
+}
+
+template <typename Data>
+MatrixCSR<Data>& MatrixCSR::operator=(const MatrixCSR& toCopy){
+  MatrixCSR<Data> tmp(toCopy);
+  std::swap(*this, tmp);
+  delete tmp;
+  return *this;
+}
+
+template <typename Data>
+MatrixCSR<Data>& MatrixCSR::operator=(MatrixCSR&& toMove) noexcept{
+  MatrixCSR<Data> tmp(std::move(toMove));
+  std::swap(*this, tmp);
+  delete tmp;
+  return *this;
+}
+
+template <typename Data>
+bool MatrixCSR<Data>::operator==(const MatrixCSR& toCompare) const noexcept{
+
+}
+
+template <typename Data>
+bool MatrixCSR<Data>::operator!=(const MatrixCSR& toCompare) const noexcept{
+  return !(*this == toCompare);
+}
+
+template <typename Data>
+void RowResize(const ulong& new_row_size){
+  R.Resize(new_row_size+1);
+  for(ulong i=rows ; i<new_row_size+1 ; ++i){
+    R[i] = R[rows];
+  }
+  rows = new_row_size;
+  size = new_row_size * columns;
+}
 
 /* ************************************************************************** */
 
diff --git a/librerie/exercise5/matrix/csr/matrixcsr.hpp b/librerie/exercise5/matrix/csr/matrixcsr.hpp
index 9765894..14b5ea3 100644
--- a/librerie/exercise5/matrix/csr/matrixcsr.hpp
+++ b/librerie/exercise5/matrix/csr/matrixcsr.hpp
@@ -6,96 +6,102 @@
 
 #include "../matrix.hpp"
 
-// #include "../../list/list.hpp"
-// #include "../../vector/vector.hpp"
-
-/* ************************************************************************** */
+#include "../../list/list.hpp"
+#include "../../vector/vector.hpp"
 
 namespace lasd {
 
-/* ************************************************************************** */
-
 template <typename Data>
-class MatrixCSR { // Must extend Matrix<Data>
-
-private:
-
-  // ...
+class MatrixCSR : virtual public List<Data>,
+                  virtual public Matrix<Data>{ // Must extend Matrix<Data>
 
 protected:
 
-  // using Matrix<Data>::???;
+  using Matrix<Data>::rows;
+  using Matrix<Data>::columns;
+  using List<std::pair<Data,ulong>>::size;
 
-  // ...
+  Vector<struct List<std::pair<Data,ulong>>::Node**> R(1);
+
+  using List<std::pair<Data,ulong>>::head;
+  using struct List<std::pair<Data,ulong>>::Node;
+
+/*
+  Node
+  | pair
+  | | Data (actual element - first)
+  | | ulong (column index - second)
+  | next
+*/
 
 public:
 
   // Default constructor
-  // MatrixCSR() specifiers;
+  MatrixCSR();
 
   /* ************************************************************************ */
 
   // Specific constructors
-  // MatrixCSR(argument) specifiers; // A matrix of some specified dimension
+  MatrixCSR(const ulong&, const ulong&); // A matrix of some specified dimension
 
   /* ************************************************************************ */
 
   // Copy constructor
-  // MatrixCSR(argument) specifiers;
+  MatrixCSR(const MatrixCSR&);
 
   // Move constructor
-  // MatrixCSR(argument) specifiers;
+  MatrixCSR(MatrixCSR&&) noexcept;
 
   /* ************************************************************************ */
 
   // Destructor
-  // ~MatrixCSR() specifiers;
+  virtual ~MatrixCSR();
 
   /* ************************************************************************ */
 
   // Copy assignment
-  // type operator=(argument) specifiers;
+  MatrixCSR& operator=(const MatrixCSR&);
 
   // Move assignment
-  // type operator=(argument) specifiers;
+  MatrixCSR& operator=(MatrixCSR&&) noexcept;
 
   /* ************************************************************************ */
 
   // Comparison operators
-  // type operator==(argument) specifiers;
-  // type operator!=(argument) specifiers;
+  bool operator==(const MatrixCSR&) const noexcept;
+  bool operator!=(const MatrixCSR&) const noexcept;
 
   /* ************************************************************************ */
 
   // Specific member functions (inherited from Matrix)
 
-  // type RowResize() specifiers; // Override Matrix member
-  // type ColumnResize() specifiers; // Override Matrix member
+  void RowResize(const ulong&) override; // Override Matrix member
+  void ColumnResize(const ulong&) override; // Override Matrix member
 
-  // type ExistsCell() specifiers; // Override Matrix member (should not throw exceptions)
+  bool ExistsCell(const ulong&, const ulong&) override noexcept; // Override Matrix member (should not throw exceptions)
 
-  // type operator()() specifiers; // Override Matrix member (mutable access to the element; throw out_of_range when out of range)
-  // type operator()() specifiers; // Override Matrix member (immutable access to the element; throw out_of_range when out of range and length_error when not present)
+  Data& operator()(const ulong&, const ulong&) override; // Override Matrix member (mutable access to the element; throw out_of_range when out of range)
+  const Data& operator()(const ulong&, const ulong&) const override; // Override Matrix member (immutable access to the element; throw out_of_range when out of range and length_error when not present)
 
   /* ************************************************************************ */
 
   // Specific member functions (inherited from Container)
 
-  // type Clear() specifiers; // Override Container member
+  void Clear() override; // Override Container member
 
   /* ************************************************************************ */
 
   // Specific member functions (inherited from MappableContainer)
 
-  // type MapPreOrder(arguments) specifiers; // Override MappableContainer member
-  // type MapPostOrder(arguments) specifiers; // Override MappableContainer member
+   virtual void MapPreOrder(const typename MappableContainer<Data>::MapFunctor, void*) override; // Override MappableContainer member
+   virtual void MapPostOrder(const typename MappableContainer<Data>::MapFunctor, void*) override; // Override MappableContainer member
 
   /* ************************************************************************ */
 
   // Specific member functions (inherited from FoldableContainer)
 
-  // type FoldPreOrder(arguments) specifiers; // Override FoldableContainer member
-  // type FoldPostOrder(arguments) specifiers; // Override FoldableContainer member
+  virtual void FoldPreOrder(const typename FoldableContainer<Data>::FoldFunctor, const void*, void*) const override; // Override FoldableContainer member
+  virtual void FoldPostOrder(const typename FoldableContainer<Data>::FoldFunctor, const void*, void*) const override; // Override FoldableContainer member
 
 };
 
diff --git a/librerie/exercise5/matrix/vec/matrixvec.cpp b/librerie/exercise5/matrix/vec/matrixvec.cpp
index 21b0d4a..1eaa023 100644
--- a/librerie/exercise5/matrix/vec/matrixvec.cpp
+++ b/librerie/exercise5/matrix/vec/matrixvec.cpp
@@ -13,7 +13,7 @@ template <typename Data>
 MatrixVec<Data>::MatrixVec(const MatrixVec& toCopy){
   rows = toCopy.rows;
   columns = toCopy.columns;
-  size = toCopy.rows * toCopy.columns;
+  size = toCopy.size;
   Elements = new Data[size]{};
   for(ulong i=0 ; i<size ; ++i){
     Elements[i] = toCopy.Elements[i];
@@ -38,7 +38,7 @@ MatrixVec& MatrixVec<Data>::operator=(const MatrixVec& toCopy){
   Clear();
   rows = toCopy.rows;
   columns = toCopy.columns;
-  size = toCopy.rows * toCopy.columns;
+  size = toCopy.size;
   Elements = new Data[size]{};
   for(ulong i=0 ; i<size ; ++i){
     Elements[i] = toCopy.Elements[i];
@@ -77,28 +77,17 @@ void MatrixVec<Data>::RowResize(const ulong newdim){
 
 template <typename Data>
 void MatrixVec<Data>::ColumnResize(const ulong& new_column_dim){
-
   if(new_column_dim == 0){
     Clear();
   }
   else if(new_column_dim != columns){
-
+    ulong limit = (new_column_dim < columns)? new_column_dim : columns;
     Data* tmp = new Data[rows * new_column_dim]{};
-
-    if(new_column_dim > columns){
-      for(ulong i=0 ; i<r ; ++i){
-        for(ulong j=0 ; j<new_column_dim ; ++j){
-          if(ExistsCell(i,j)) tmp[(i*new_column_dim)+j] = (*this)(i,j);
-        }
-      }
-    }else if(new_column_dim < columns){
-      for(ulong i=0 ; i<r ; ++i){
-        for(ulong j=0 ; j<new_column_dim ; ++j){
-          tmp[(i*new_column_dim)+j] = (*this)(i,j);
-        }
+    for(ulong i=0 ; i<r ; ++i){
+      for(ulong j=0 ; j<limit ; ++j){
+        tmp[(i*new_column_dim)+j] = (*this)(i,j);
       }
     }
-
     size = rows * new_column_dim;
     columns = new_column_dim;
     std::swap(Elements, tmp);