riordinato alcuni package e creato una prima implementazione di set e mergetemplate

utility/euler_tour/EulerTour.java

@@ -0,0 +1,41 @@
+package utility.euler_tour;
+
+import tree.binarytree.*;
+import position.Position;
+
+
+
+public abstract class EulerTour<E, R> {
+  protected BinaryTree<E> tree;
+
+  public abstract R execute(BinaryTree<E> T);
+
+  protected void init(BinaryTree<E> T) { tree = T; }
+
+  protected R eulerTour(Position<E> v) {
+    TourResult<R> r = new TourResult<R>();
+    visitLeft(v, r);
+    if (tree.hasLeft(v))
+      r.left = eulerTour(tree.left(v));
+    visitBelow(v, r);
+    if (tree.hasRight(v))
+      r.right = eulerTour(tree.right(v));
+    visitRight(v, r);
+    return r.out;
+  }
+
+  protected void visitLeft(Position<E> v, TourResult<R> r) {}
+
+  protected void visitBelow(Position<E> v, TourResult<R> r) {}
+
+  protected void visitRight(Position<E> v, TourResult<R> r) {}
+
+
+  public class TourResult<R> {
+    public R left;
+    public R right;
+    public R out; 
+  }
+
+}
+