diff --git a/librerie/exercise5/build.sh b/librerie/exercise5/build.sh
index 17349be..5ccdfe1 100755
--- a/librerie/exercise5/build.sh
+++ b/librerie/exercise5/build.sh
@@ -1,7 +1,7 @@
 
 #! /bin/bash
 
-g++-10 -o main \
+g++-10 -g -o main \
   zlasdtest/exercise1/simpletest.cpp zlasdtest/exercise1/fulltest.cpp \
   zlasdtest/exercise2/simpletest.cpp zlasdtest/exercise2/fulltest.cpp \
   zlasdtest/exercise3/simpletest.cpp zlasdtest/exercise3/fulltest.cpp \
diff --git a/librerie/exercise5/matrix/csr/matrixcsr.cpp b/librerie/exercise5/matrix/csr/matrixcsr.cpp
index 13c0f0a..8f2a2b2 100755
--- a/librerie/exercise5/matrix/csr/matrixcsr.cpp
+++ b/librerie/exercise5/matrix/csr/matrixcsr.cpp
@@ -218,6 +218,7 @@ Data& MatrixCSR<Data>::operator()(const ulong& r, const ulong& c){
     struct List<std::pair<Data,ulong>>::Node* nextNode = *ptr;
     *ptr = newNode;
     newNode->next = nextNode;
+    (newNode->value).second = c;
 
     if(last == ptr){ // the newely inserted element is the last one in its row
       for(ulong i=r+1 ; i<R.Size() ; ++i){ // then for each next row
diff --git a/librerie/exercise5/matrix/vec/matrixvec.cpp b/librerie/exercise5/matrix/vec/matrixvec.cpp
index a7bc319..0c3cbce 100755
--- a/librerie/exercise5/matrix/vec/matrixvec.cpp
+++ b/librerie/exercise5/matrix/vec/matrixvec.cpp
@@ -72,7 +72,13 @@ bool MatrixVec<Data>::operator!=(const MatrixVec& toCompare) const noexcept{
 
 template <typename Data>
 void MatrixVec<Data>::RowResize(const ulong& newdim){
-  Vector<Data>::Resize(newdim);
+  if(newdim == 0){
+    Clear();
+  }else{
+    Vector<Data>::Resize(newdim * columns);
+    rows = newdim;
+    size = newdim * columns;
+  }
 }
 
 template <typename Data>
diff --git a/librerie/exercise5/zlasdtest/exercise5/simpletest.cpp b/librerie/exercise5/zlasdtest/exercise5/simpletest.cpp
index 6a94395..dcb0ee9 100755
--- a/librerie/exercise5/zlasdtest/exercise5/simpletest.cpp
+++ b/librerie/exercise5/zlasdtest/exercise5/simpletest.cpp
@@ -36,6 +36,7 @@ void stestMatrixInt(Mat<long>& mat, uint& testnum, uint& testerr) {
     SetRowNumber(loctestnum, loctesterr, mat, true, 1);
     SetColumnNumber(loctestnum, loctesterr, mat, true, 1);
 
+    std::cout<<"\nClearing the matrix\n";
     mat.Clear();
 
     ExistsCell(loctestnum, loctesterr, mat, false, 0, 0);
@@ -45,10 +46,10 @@ void stestMatrixInt(Mat<long>& mat, uint& testnum, uint& testerr) {
     SetColumnNumber(loctestnum, loctesterr, mat, true, 4);
     GetColumnNumber(loctestnum, loctesterr, mat, true, 4);
 
-    SetCell<long>(loctestnum, loctesterr, mat, true, 0, 1, 1);
-    SetCell<long>(loctestnum, loctesterr, mat, true, 1, 0, 2);
+    SetCell<long>(loctestnum, loctesterr, mat, true, 0, 1, 1); //15
+    SetCell<long>(loctestnum, loctesterr, mat, true, 1, 0, 2);//16
 
-    SetCell<long>(loctestnum, loctesterr, mat, true, 2, 1, 3);
+    SetCell<long>(loctestnum, loctesterr, mat, true, 2, 1, 3);//17
 
     SetCell<long>(loctestnum, loctesterr, mat, true, 0, 3, 4);
     SetCell<long>(loctestnum, loctesterr, mat, true, 2, 3, 5);
@@ -58,8 +59,8 @@ void stestMatrixInt(Mat<long>& mat, uint& testnum, uint& testerr) {
 
     Mat<long> copmat(mat);
 
-    MapPreOrder<long, long>(loctestnum, loctesterr, mat, true, &MapPrint<long>, 0);
-    MapPreOrder<long, long>(loctestnum, loctesterr, copmat, true, &MapPrint<long>, 0);
+    MapPreOrder<long, long>(loctestnum, loctesterr, mat, true, &MapPrint<long>, 0); //22
+    MapPreOrder<long, long>(loctestnum, loctesterr, copmat, true, &MapPrint<long>, 0); //23
     MapPostOrder<long, long>(loctestnum, loctesterr, mat, true, &MapPrint<long>, 0);
     MapPostOrder<long, long>(loctestnum, loctesterr, copmat, true, &MapPrint<long>, 0);
 
@@ -73,7 +74,7 @@ void stestMatrixInt(Mat<long>& mat, uint& testnum, uint& testerr) {
 
     MapPreOrder<long, long>(loctestnum, loctesterr, mat, true, &MapDecrement<long>, 0);
 
-    SetColumnNumber(loctestnum, loctesterr, mat, true, 5);
+    SetColumnNumber(loctestnum, loctesterr, mat, true, 5); //31
 
     SetCell<long>(loctestnum, loctesterr, mat, true, 1, 4, 8);
     SetCell<long>(loctestnum, loctesterr, mat, true, 3, 4, 9);
@@ -88,7 +89,7 @@ void stestMatrixInt(Mat<long>& mat, uint& testnum, uint& testerr) {
 
     MapPreOrder<long, long>(loctestnum, loctesterr, mat, true, &MapIncrement<long>, 0);
 
-    MapPreOrder<long, long>(loctestnum, loctesterr, mat, true, &MapPrint<long>, 0);
+    MapPreOrder<long, long>(loctestnum, loctesterr, mat, true, &MapPrint<long>, 0); //40
 
     FoldPreOrder<long, long, long>(loctestnum, loctesterr, mat, true, &FoldMultiply<long>, 0, 1, 168);
 
@@ -100,7 +101,7 @@ void stestMatrixInt(Mat<long>& mat, uint& testnum, uint& testerr) {
     MapPreOrder<long, long>(loctestnum, loctesterr, mat, true, &MapPrint<long>, 0);
     MapPostOrder<long, long>(loctestnum, loctesterr, mat, true, &MapPrint<long>, 0);
 
-    FoldPreOrder<long, long, long>(loctestnum, loctesterr, mat, true, &FoldAdd<long>, 0, 0, 6);
+    FoldPreOrder<long, long, long>(loctestnum, loctesterr, mat, true, &FoldAdd<long>, 0, 0, 6); //47
 
     MapPostOrder<long, long>(loctestnum, loctesterr, mat, true, &MapIncrement<long>, 0);
 
diff --git a/librerie/exercise5/zlasdtest/test.cpp b/librerie/exercise5/zlasdtest/test.cpp
index 443ad27..9d6a50c 100755
--- a/librerie/exercise5/zlasdtest/test.cpp
+++ b/librerie/exercise5/zlasdtest/test.cpp
@@ -19,14 +19,14 @@ using namespace std;
 
 void lasdtest() {
   cout << endl << "~*~#~*~ Welcome to the LASD Test Suite ~*~#~*~ " << endl;
-  testSimpleExercise1();
-  testFullExercise1();
-  testSimpleExercise2();
-  testFullExercise2();
-  testSimpleExercise3();
-  testFullExercise3();
-  testSimpleExercise4();
-  testFullExercise4();
+  // testSimpleExercise1();
+  // testFullExercise1();
+  // testSimpleExercise2();
+  // testFullExercise2();
+  // testSimpleExercise3();
+  // testFullExercise3();
+  // testSimpleExercise4();
+  // testFullExercise4();
   testSimpleExercise5();
   testFullExercise5();
   cout << endl << "Goodbye!" << endl;
diff --git a/librerie/exercise5_alessandro.zip b/librerie/exercise5_alessandro.zip
new file mode 100644
index 0000000..5cbda9e
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