Fenòmens p4: allow to save final configuration

Change-Id: I9f14110403a8313357ab04df624373789de47233
diff --git a/quad10/fenomens/lab/p4/writeconfig.f90 b/quad10/fenomens/lab/p4/writeconfig.f90
new file mode 100644
index 0000000..30de3c9
--- /dev/null
+++ b/quad10/fenomens/lab/p4/writeconfig.f90
@@ -0,0 +1,19 @@
+subroutine writeConfig(S, L, NOM)
+  implicit none
+  integer*4, intent(in) :: L
+  integer*2, intent(out) :: S(1:L,1:L)
+  integer*4 :: i, j
+  character(200) :: NOM
+
+  open(17, file = trim(NOM))
+
+  do i = 1, L
+    do j = 1, L
+      if (S(i, j) == 1) then
+        write(17, *) i, j
+      endif
+    enddo
+  enddo
+
+  close(17)
+end subroutine writeConfig