diff --git a/hybrid/hello_world_mpi_openmp.c b/hybrid/hello_world_mpi_openmp.c
deleted file mode 100644
index 606d0cc..0000000
--- a/hybrid/hello_world_mpi_openmp.c
+++ /dev/null
@@ -1,21 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-#include <omp.h>
-
-int main(int argc, char *argv[]) {
-  int numprocs, rank, namelen;
-  int * provided;
-  char processor_name[MPI_MAX_PROCESSOR_NAME];
-  int iam = 0, np = 1;
-  MPI_Init_thread(&argc, &argv,MPI_THREAD_SINGLE,provided);
-  MPI_Comm_size(MPI_COMM_WORLD, &numprocs);
-  MPI_Comm_rank(MPI_COMM_WORLD, &rank);
-  #pragma omp parallel default(shared) private(iam, np)
-  {
-    np = omp_get_num_threads();
-    iam = omp_get_thread_num();
-    printf("Hello from thread %d out of %d from process %d out of %d on\n",iam, np, rank, numprocs);
-  }
-  MPI_Finalize();
-}
-
diff --git a/mpi/exchange.c b/mpi/exchange.c
deleted file mode 100644
index 9241f70..0000000
--- a/mpi/exchange.c
+++ /dev/null
@@ -1,26 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-int main(int argc, char *argv[]) {
-   int rank;
-   int buf1[100];
-   int buf2[100];
-   MPI_Request request;
-   MPI_Status status;
-   MPI_Init(&argc, &argv);
-   MPI_Comm_rank(MPI_COMM_WORLD, &rank);
-
-   if (rank == 0) {
-      MPI_Isend(buf1, 10, MPI_INT, 1, 0, MPI_COMM_WORLD, &request);
-      MPI_Recv(buf2, 10, MPI_INT, 1, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
-   }else if (rank == 1){
-      MPI_Isend(buf1, 10, MPI_INT, 0, 0, MPI_COMM_WORLD, &request);
-      MPI_Recv(buf2, 10, MPI_INT, 0, 0,MPI_COMM_WORLD, MPI_STATUS_IGNORE);
-   }
-
-   MPI_Wait(&request, &status);
-   memcpy(buf1, buf2, 10*sizeof(int));
-
-   MPI_Finalize();
-}
-
diff --git a/mpi/exchange_sendrecv.c b/mpi/exchange_sendrecv.c
deleted file mode 100644
index e0e1c0c..0000000
--- a/mpi/exchange_sendrecv.c
+++ /dev/null
@@ -1,23 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-int main(int argc, char *argv[]) {
-   int rank;
-   int buf1[100];
-   int buf2[100];
-   MPI_Request request;
-   MPI_Status status;
-   MPI_Init(&argc, &argv);
-   MPI_Comm_rank(MPI_COMM_WORLD, &rank);
-
-   if (rank == 0)	{
-      MPI_Sendrecv(buf1, 10, MPI_INT, 1, 0, buf2, 10, MPI_INT, 1, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
-   } else if (rank == 1) {
-      MPI_Sendrecv(buf1, 10, MPI_INT, 0, 0, buf2, 10, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
-   }
-
-   memcpy(buf1, buf2, 10*sizeof(int));
-
-   MPI_Finalize();
-}
-
diff --git a/mpi/exchange_sendrecv_replace.c b/mpi/exchange_sendrecv_replace.c
deleted file mode 100644
index b17779e..0000000
--- a/mpi/exchange_sendrecv_replace.c
+++ /dev/null
@@ -1,21 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-int main(int argc, char *argv[]) {
-   int rank;
-   int buf1[100];
-   int buf2[100];
-   MPI_Request request;
-   MPI_Status status;
-   MPI_Init(&argc, &argv);
-   MPI_Comm_rank(MPI_COMM_WORLD, &rank);
-
-   if (rank == 0){
-      MPI_Sendrecv_replace(buf1, 10, MPI_INT, 1, 0, 1, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
-   } else if (rank == 1) {
-      MPI_Sendrecv_replace(buf1, 10, MPI_INT, 0, 0, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
-   }
-
-   MPI_Finalize();
-}
-
diff --git a/mpi/helloworld.c b/mpi/helloworld.c
deleted file mode 100644
index 94cb327..0000000
--- a/mpi/helloworld.c
+++ /dev/null
@@ -1,13 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-int main(int argc, char *argv[]){
-   int size, rank;
-   MPI_Init(&argc, &argv);
-   MPI_Comm_size(MPI_COMM_WORLD, &size);
-   MPI_Comm_rank(MPI_COMM_WORLD, &rank);
-
-   printf("I'm process %d out of %d\n", rank, size);
-
-   MPI_Finalize();
-}
diff --git a/mpi/image_parts_gather.c b/mpi/image_parts_gather.c
deleted file mode 100644
index 854301b..0000000
--- a/mpi/image_parts_gather.c
+++ /dev/null
@@ -1,41 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-#define image_size 1024
-
-int main(int argc, char *argv[]) {
-   int myrank, mysize;
-   int * imgPart;
-   int * buf;
-   int i;
-   int partSize;
-   int count;
-
-   MPI_Request request;
-   MPI_Status status;
-   MPI_Status s; 
-
-   MPI_Init(&argc, &argv);
-   MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
-   MPI_Comm_size(MPI_COMM_WORLD, &mysize);
-
-   imgPart = (int*)malloc(image_size/mysize * sizeof(int));
-
-/* Generate image parts */
-   for (i=0; i < (image_size/mysize) ; i++){
-      imgPart[i] = myrank * 1;
-   }
-   partSize = image_size/mysize;
-
-/* Process 0 is the root of the collective, i.e. the receiver of all parts */
-   if (myrank == 0) /* Only the root must allocate buf */
-      buf = (int*)malloc(image_size* sizeof(int));
-
-   MPI_Gather(imgPart, partSize, MPI_INT, buf, partSize, MPI_INT, 0, MPI_COMM_WORLD);
-
-   free(imgPart);
-   if (myrank==0) free(buf);
-
-   MPI_Finalize();
-}
-
diff --git a/mpi/image_parts_in_order.c b/mpi/image_parts_in_order.c
deleted file mode 100644
index 2cab710..0000000
--- a/mpi/image_parts_in_order.c
+++ /dev/null
@@ -1,44 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-#define image_size 1024
-
-int main(int argc, char *argv[]) {
-   int myrank, mysize;
-   int * imgPart;
-   int * buf;
-   int i;
-   int partSize;
-
-   MPI_Request request;
-   MPI_Status status;
-   MPI_Init(&argc, &argv);
-   MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
-   MPI_Comm_size(MPI_COMM_WORLD, &mysize);
-
-   imgPart = malloc(image_size/mysize * sizeof(int));
-
-/* Generate image parts */
-   for (i=0; i < (image_size/mysize) ; i++){
-      imgPart[i] = myrank * 1;
-   }
-   partSize = image_size/mysize;
-/* Each process sends */
-   MPI_Isend(imgPart, partSize, MPI_INT, 0, 0, MPI_COMM_WORLD, &request);
-
-// Process 0 receives all parts into buf
-   if (myrank == 0){
-      buf = malloc(image_size* sizeof(int));
-      for (i=0; i<mysize; i++){
-         MPI_Recv(buf + i*(image_size/mysize), (image_size/mysize), MPI_INT, i, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
-      }
-   }
-
-   MPI_Wait(&request, MPI_STATUS_IGNORE);
-
-   free(imgPart);
-   if (myrank==0) free(buf);
-
-   MPI_Finalize();
-}
-
diff --git a/mpi/image_parts_out_of_order.c b/mpi/image_parts_out_of_order.c
deleted file mode 100644
index 271a0fb..0000000
--- a/mpi/image_parts_out_of_order.c
+++ /dev/null
@@ -1,48 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-#define image_size 1024
-
-int main(int argc, char *argv[]) {
-   int myrank, mysize;
-   int * imgPart;
-   int * buf;
-   int i;
-   int partSize;
-   int count;
-
-   MPI_Request request;
-   MPI_Status status;
-   MPI_Status s; 
-
-   MPI_Init(&argc, &argv);
-   MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
-   MPI_Comm_size(MPI_COMM_WORLD, &mysize);
-
-   imgPart = (int*)malloc(image_size/mysize * sizeof(int));
-
-/* Generate image parts */
-   for (i=0; i < (image_size/mysize) ; i++){
-      imgPart[i] = myrank * 1;
-   }
-   partSize = image_size/mysize;
-
-/* Each process sends */
-   MPI_Isend(imgPart, partSize, MPI_INT, 0, 0, MPI_COMM_WORLD, &request);
-// Process 0 receives all parts into buf
-   if (myrank == 0) {
-      buf = (int*)malloc(image_size* sizeof(int));
-      for (i=0; i<mysize; i++) {
-         MPI_Probe(MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &s);
-         MPI_Get_count(&s, MPI_INT, &count);
-         MPI_Recv(buf + s.MPI_SOURCE*count, count, MPI_INT, s.MPI_SOURCE, s.MPI_TAG, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
-      } 
-   } 
-   MPI_Wait(&request, MPI_STATUS_IGNORE);
-
-   free(imgPart);
-   if (myrank==0) free(buf);
-
-   MPI_Finalize();
-}
-
diff --git a/mpi/iping.c b/mpi/iping.c
deleted file mode 100644
index 88d1980..0000000
--- a/mpi/iping.c
+++ /dev/null
@@ -1,18 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-int main(int argc, char *argv[]) {
-   int rank;
-   int buf[100];
-   MPI_Request request;
-   MPI_Status status;
-   MPI_Init(&argc, &argv);
-   MPI_Comm_rank(MPI_COMM_WORLD, &rank);
-   if (rank == 0)
-      MPI_Isend(buf, 100, MPI_INT, 1, 0,MPI_COMM_WORLD, &request);
-   else if (rank == 1)
-      MPI_Irecv(buf, 100, MPI_INT, 0, 0,MPI_COMM_WORLD, &request);
-   MPI_Wait(&request, &status);
-   MPI_Finalize();
-}
-
diff --git a/mpi/new_comm.c b/mpi/new_comm.c
deleted file mode 100644
index 248a555..0000000
--- a/mpi/new_comm.c
+++ /dev/null
@@ -1,35 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-int main(int argc, char *argv[]) {
-   int myrank, mysize, new_rank;
-   int i;
-   int * ranks1;
-   int * ranks2;
-   int nbr_g1 = 5;
-
-   MPI_Group old_g, new_g;
-   MPI_Comm new_comm;
-
-   MPI_Init(&argc,&argv);
-   MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
-   MPI_Comm_size(MPI_COMM_WORLD, &mysize);
-
-   MPI_Comm_group(MPI_COMM_WORLD, &old_g);
-
-   ranks1 = (int*) malloc(nbr_g1*sizeof(int));
-   ranks2 = (int*) malloc((mysize-nbr_g1)*sizeof(int));
-   for (i=0;i<nbr_g1;i++)  ranks1[i]=i;
-   for (i=0;i<(mysize-nbr_g1);i++) ranks2[i]=mysize-i-1;
-
-   if (myrank < nbr_g1) {
-      MPI_Group_incl(old_g,nbr_g1,ranks1,&new_g);
-   } else {
-      MPI_Group_incl(old_g,(mysize-nbr_g1),ranks2,&new_g);
-   } 
-   MPI_Comm_create(MPI_COMM_WORLD,new_g,&new_comm);
-   MPI_Group_rank (new_g, &new_rank);
-   printf("MPI_COMM_WORLD rank %d new communicator rank is %d \n",myrank,new_rank);
-   MPI_Finalize();
-}
-
diff --git a/mpi/new_type.c b/mpi/new_type.c
deleted file mode 100644
index eee684b..0000000
--- a/mpi/new_type.c
+++ /dev/null
@@ -1,53 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-struct foo { int a; char b; };
-
-int main(int argc, char *argv[]) {
-   int myrank, mysize;
-   int * imgPart;
-   int blen[2];
-   MPI_Aint indices[2];
-   int oldtypes[2];
-
-   struct foo f;
-
-   MPI_Request request;
-   MPI_Status status;
-   MPI_Datatype newtype;
-   MPI_Aint displs[2];
-   MPI_Aint zero_address, first_address, second_address;
-
-
-   MPI_Init(&argc, &argv);
-   MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
-   MPI_Comm_size(MPI_COMM_WORLD, &mysize);
-
-   MPI_Get_address(&f, &zero_address);
-   MPI_Get_address(&f.a, &first_address);
-   MPI_Get_address(&f.b, &second_address);
-
-   blen[0] = 1; 
-   blen[1] = 1; 
-
-   oldtypes[0] = MPI_INT; 
-   oldtypes[1] = MPI_CHAR;
-
-   indices[0] = MPI_Aint_diff(first_address, zero_address);
-   indices[1] = MPI_Aint_diff(second_address, zero_address); 
-
-   MPI_Type_create_struct( 2, blen, indices, oldtypes, &newtype );
-   MPI_Type_commit(&newtype);
-
-   f.a = 1;
-   f.b = 'z';
-
-   if (myrank==0)
-      MPI_Send(&f, 1, newtype, 1, 100, MPI_COMM_WORLD );
-   if (myrank==1)
-      MPI_Send(&f, 1, newtype, 0, 100, MPI_COMM_WORLD );
-
-   MPI_Type_free( &newtype );
-   MPI_Finalize();
-}
-
diff --git a/mpi/pack_unpack.c b/mpi/pack_unpack.c
deleted file mode 100644
index 53a4673..0000000
--- a/mpi/pack_unpack.c
+++ /dev/null
@@ -1,33 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-int main(int argc, char *argv[]) {
-
-   int myrank, mysize;
-   float a;
-   int x;
-   int position = 0;
-   char buffer[100];
-   MPI_Status status;
-
-   MPI_Init(&argc, &argv);
-   MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
-   MPI_Comm_size(MPI_COMM_WORLD, &mysize);
-
-   if (myrank==0){
-      a = 2.4;
-      x = 5;
-      MPI_Pack(&a, 1, MPI_FLOAT, buffer, 100, &position, MPI_COMM_WORLD);
-      MPI_Pack(&x, 1, MPI_INT, buffer, 100, &position, MPI_COMM_WORLD);
-      MPI_Send(buffer, 100, MPI_PACKED, 1, 999, MPI_COMM_WORLD);
-      printf("Proc %d send (%E,%d) to %d \n",myrank,a,x,1);
-   }else if (myrank==1) {
-      MPI_Recv(buffer, 100, MPI_PACKED, 0, 999, MPI_COMM_WORLD, &status);
-      MPI_Unpack(buffer, 100, &position, &a, 1, MPI_FLOAT, MPI_COMM_WORLD);
-      MPI_Unpack(buffer, 100, &position, &x, 1, MPI_INT, MPI_COMM_WORLD);
-      printf("Proc %d recv (%E,%d) from %d \n",myrank,a,x,0);
-   }
-
-   MPI_Finalize();
-
-}
diff --git a/mpi/ping_correct.c b/mpi/ping_correct.c
deleted file mode 100644
index 85a622c..0000000
--- a/mpi/ping_correct.c
+++ /dev/null
@@ -1,17 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-int main(int argc, char *argv[]) {
-   int rank, size;
-   int buf[100];
-   MPI_Status status;
-   MPI_Init(&argc, &argv);
-   MPI_Comm_rank(MPI_COMM_WORLD, &rank);
-   MPI_Comm_size(MPI_COMM_WORLD, &size);
-   if (rank == 0) {
-      MPI_Send(buf, 100, MPI_INT, 1, 0, MPI_COMM_WORLD);
-   } else if (rank==1) {
-      MPI_Recv(buf, 100, MPI_INT, 0, 0, MPI_COMM_WORLD,&status);
-   }
-   MPI_Finalize();
-}
diff --git a/mpi/ping_incorrect.c b/mpi/ping_incorrect.c
deleted file mode 100644
index a4d05eb..0000000
--- a/mpi/ping_incorrect.c
+++ /dev/null
@@ -1,17 +0,0 @@
-#include <stdio.h>
-#include <mpi.h>
-
-int main(int argc, char *argv[]) {
-   int rank, size;
-   int buf[100];
-   MPI_Status status;
-   MPI_Init(&argc, &argv);
-   MPI_Comm_rank(MPI_COMM_WORLD, &rank);
-   MPI_Comm_size(MPI_COMM_WORLD, &size);
-   if (rank == 0) {
-      MPI_Send(buf, 100, MPI_INT, 1, 0, MPI_COMM_WORLD);
-   } else {
-      MPI_Recv(buf, 100, MPI_INT, 0, 0, MPI_COMM_WORLD,&status);
-   }
-   MPI_Finalize();
-}
diff --git a/openmp/dgemm_omp.c b/openmp/dgemm_omp.c
deleted file mode 100644
index 9bd941d..0000000
--- a/openmp/dgemm_omp.c
+++ /dev/null
@@ -1,63 +0,0 @@
-#include <sys/time.h>
-#include <stdio.h>
-#include <omp.h>
-
-#define N 1000
-
-double second()
-{
-        struct timeval tp;
-        int i;
-        i = gettimeofday(&tp,NULL);
-        return ( (double) tp.tv_sec + (double) tp.tv_usec * 1.e-6 );
-}
-
-int main(){
-
-	double ** A;
-	double ** B;
-	double ** C;
-	int mysize, myrank;
-	int chunk;
-	int i,j,k;
-
-	double t1,t2;
-
-	A = (double**)malloc(N*sizeof(double*));
-	B = (double**)malloc(N*sizeof(double*));
-	C = (double**)malloc(N*sizeof(double*));
-
-	for (i=0;i<N;i++){
-		A[i]=(double*)malloc(N*sizeof(double));
-		B[i]=(double*)malloc(N*sizeof(double));
-		C[i]=(double*)malloc(N*sizeof(double));
-	}
-
-	for (i=0;i<N;i++){
-		for (j=0;j<N;j++){
-		        A[i][j] = 1.0;
-		        B[i][j] = 2.0;
-		        C[i][j] = 0.0;
-		}
-	}
-
-	t1 = second();
-	#pragma omp parallel shared(A,B,C) private(i,j,k,myrank)
-	{
-	myrank=omp_get_thread_num();
-	mysize=omp_get_num_threads();
-	chunk=(N/mysize);
-	#pragma omp for schedule(runtime)
-		for (i=0;i<N;i++){
-			for (j=0;j<N;j++){
-				for (k=0;k<N;k++){
-					C[i][j]=C[i][j] + A[i][k]*B[k][j];
-				}
-			}
-		}
-	}
-	t2 = second();
-
-	printf("Time = %E [s], GF/s = %E \n",(t2-t1), (pow(N,3)/(t2-t1))/10E9 );
-
-}
diff --git a/openmp/hello_world_omp.c b/openmp/hello_world_omp.c
deleted file mode 100644
index 034dc4b..0000000
--- a/openmp/hello_world_omp.c
+++ /dev/null
@@ -1,17 +0,0 @@
-#include <stdio.h>
-#include <omp.h>
-int main(int argc, char *argv[]) {
-   int myrank=0;
-   int mysize=1;
-#if defined (_OPENMP)
-#pragma omp parallel default(shared) private(myrank, mysize)
-{
-   mysize = omp_get_num_threads();
-   myrank = omp_get_thread_num();
-#endif
-   printf("Hello from thread %d out of %d\n", myrank, mysize);
-#if defined (_OPENMP)
-}
-#endif
-   return 0;
-}
diff --git a/pi/solutions-mpi/Makefile b/pi/.solutions-mpi/Makefile
similarity index 100%
rename from pi/solutions-mpi/Makefile
rename to pi/.solutions-mpi/Makefile
diff --git a/pi/solutions-mpi/pi_1sided_get.cc b/pi/.solutions-mpi/pi_1sided_get.cc
similarity index 100%
rename from pi/solutions-mpi/pi_1sided_get.cc
rename to pi/.solutions-mpi/pi_1sided_get.cc
diff --git a/pi/solutions-mpi/pi_1sided_put.cc b/pi/.solutions-mpi/pi_1sided_put.cc
similarity index 100%
rename from pi/solutions-mpi/pi_1sided_put.cc
rename to pi/.solutions-mpi/pi_1sided_put.cc
diff --git a/pi/solutions-mpi/pi_gather_bcast.cc b/pi/.solutions-mpi/pi_gather_bcast.cc
similarity index 100%
rename from pi/solutions-mpi/pi_gather_bcast.cc
rename to pi/.solutions-mpi/pi_gather_bcast.cc
diff --git a/pi/solutions-mpi/pi_hello.cc b/pi/.solutions-mpi/pi_hello.cc
similarity index 100%
rename from pi/solutions-mpi/pi_hello.cc
rename to pi/.solutions-mpi/pi_hello.cc
diff --git a/pi/solutions-mpi/pi_io_at.cc b/pi/.solutions-mpi/pi_io_at.cc
similarity index 100%
rename from pi/solutions-mpi/pi_io_at.cc
rename to pi/.solutions-mpi/pi_io_at.cc
diff --git a/pi/solutions-mpi/pi_p2p_async.cc b/pi/.solutions-mpi/pi_p2p_async.cc
similarity index 100%
rename from pi/solutions-mpi/pi_p2p_async.cc
rename to pi/.solutions-mpi/pi_p2p_async.cc
diff --git a/pi/solutions-mpi/pi_p2p_derived_type.cc b/pi/.solutions-mpi/pi_p2p_derived_type.cc
similarity index 100%
rename from pi/solutions-mpi/pi_p2p_derived_type.cc
rename to pi/.solutions-mpi/pi_p2p_derived_type.cc
diff --git a/pi/solutions-mpi/pi_p2p_persistent.cc b/pi/.solutions-mpi/pi_p2p_persistent.cc
similarity index 100%
rename from pi/solutions-mpi/pi_p2p_persistent.cc
rename to pi/.solutions-mpi/pi_p2p_persistent.cc
diff --git a/pi/solutions-mpi/pi_p2p_sendrecv.cc b/pi/.solutions-mpi/pi_p2p_sendrecv.cc
similarity index 100%
rename from pi/solutions-mpi/pi_p2p_sendrecv.cc
rename to pi/.solutions-mpi/pi_p2p_sendrecv.cc
diff --git a/pi/solutions-mpi/pi_p2p_sync.cc b/pi/.solutions-mpi/pi_p2p_sync.cc
similarity index 100%
rename from pi/solutions-mpi/pi_p2p_sync.cc
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