Пример #1
0
  /** Unit tests */
  public static void main(String[] args) {
    final Tree targetTree =
        tree(
            1,
            tree(
                2,
                tree(3, tree(4), tree(3, tree(4), tree(5))),
                tree(5, tree(6, tree(7), tree(8, tree(9), tree())), tree(10, tree(11), tree()))),
            tree(12));

    System.out.println("    Test Pattern");
    checkPattern(targetTree, tree(), Optional.of(targetTree));

    checkPattern(targetTree, tree(9), Optional.of(tree(9)));
    checkPattern(targetTree, tree(12), Optional.of(tree(12)));
    checkPattern(targetTree, tree(13), Optional.empty());
    checkPattern(targetTree, tree(1), Optional.of(targetTree));

    checkPattern(targetTree, tree(2, tree(3), tree(5)), Optional.of(targetTree.left()));
    checkPattern(
        targetTree, tree(3, tree(4), tree(5)), Optional.of(targetTree.left().left().right()));
    checkPattern(
        targetTree, tree(6, tree(), tree(8)), Optional.of(targetTree.left().right().left()));
    checkPattern(targetTree, tree(6, tree(), tree(7)), Optional.empty());

    checkPattern(
        targetTree,
        tree(5, tree(6, tree(7), tree(8, tree(9), tree())), tree(10, tree(11), tree())),
        Optional.of(targetTree.left().right()));
  }
Пример #2
0
  static boolean prefixMatches(Tree target, Tree pattern) {
    if (pattern.isEmpty()) return true;
    if (target.isEmpty() || target.value() != pattern.value()) return false;

    return prefixMatches(target.left(), pattern.left())
        && prefixMatches(target.right(), pattern.right());
  }
Пример #3
0
  public static Tree ConstructBST(Tree root, int A) {
    if (root == null) {
      root = new Tree(A);
      root.left = null;
      root.right = null;
    } else {
      if (A < root.value) {
        if (root.left != null) ConstructBST(root.left, A);
        else root.left = new Tree(A);
      } else if (A > root.value) {
        if (root.right != null) ConstructBST(root.right, A);
        else root.right = new Tree(A);
      }
    }

    return root;
  }
 /*
  * Trim BST - Given min and max trim the tree so that all nodes has values between min and max
  */
 public Tree trimTree(Tree node, int min, int max) {
   if (node == null) return null;
   node.left = trimTree(node.left, min, max);
   node.right = trimTree(node.right, min, max);
   if (node.value < min) return node.right;
   else if (node.value > max) return node.left;
   else return node;
 }
Пример #5
0
  /**
   * Search the tree for the first instance of `pattern`, giving preference to the left child.
   *
   * <p>`pattern` is a tree, representing a pattern of nodes. `NilNode`s should be considered
   * wildcards.
   *
   * <p>Example patterns ---------------- `Tree()` Matches any tree.
   *
   * <p>`Tree(3)` Matches any tree where the root node has a value of `3`.
   *
   * <p>`Tree(3, Tree(2), Tree())` Matches any tree where the root node has a value of `3`, and a
   * left sub-tree with a root value of `2`, and any (or no) right sub-tree.
   */
  static Optional<Tree> find(Tree target, Tree pattern) {
    if (pattern.isEmpty()) return Optional.of(target);
    if (target.isEmpty()) return Optional.empty();
    if (prefixMatches(target, pattern)) return Optional.of(target);

    Optional<Tree> leftMatch = find(target.left(), pattern);
    if (leftMatch.isPresent()) return leftMatch;
    return find(target.right(), pattern);
  }
Пример #6
0
  public static void DoubleTree(Tree root) {
    if (root == null) System.out.print("I shouldnt be here");
    if (root.left != null) DoubleTree(root.left);
    // DoubleTree(root);
    if (root.right != null) DoubleTree(root.right);

    Tree temp = root.left;
    root.left = new Tree(root.value);
    root.left.left = temp;
  }
 public Tree add(Tree node, int value) {
   if (node == null) {
     node = new Tree(value);
     return node;
   } else {
     if (value < node.value) node.left = add(node.left, value);
     else node.right = add(node.right, value);
   }
   return node;
 }
 public Tree addNode(int item, Tree tree) {
   if (tree == null) {
     tree = new Tree(item, null, null);
   } else {
     if (item < tree.data) {
       if (tree.left == null) {
         tree.left = new Tree(item, null, null);
       } else {
         addNode(item, tree.left);
       }
     } else if (item > tree.data) {
       if (tree.right == null) {
         tree.right = new Tree(item, null, null);
       } else {
         addNode(item, tree.right);
       }
     }
   }
   return tree;
 }