writeSplit.C

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/*
                          Aleph_w
 
  Data structures & Algorithms
  version 2.0.0b
  https://github.com/lrleon/Aleph-w
 
  This file is part of Aleph-w library
 
  Copyright (c) 2002-2026 Leandro Rabindranath Leon
 
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
 
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
 
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/
 
 
# include <cstdlib>
# include <cassert>
 
# include <iostream>
# include <fstream>
# include <tclap/CmdLine.h>
# include <aleph.H>
# include <tpl_dynArray.H>
# include <tpl_binNodeXt.H>
# include <tpl_binNodeUtils.H>
# include <tpl_binTree.H>
 
using namespace Aleph;
 
using namespace std;
 
typedef BinNodeXt<int> Node;
 
// Output streams
ofstream output;
ofstream output_1;
ofstream output_2;
 
void print_key(Node* p, int, int)
{
  output << p->get_key() << " ";
}
 
void print_key1(Node* p, int, int)
{
  output_1 << p->get_key() << " ";
}
 
void print_key2(Node* p, int, int)
{
  output_2 << p->get_key() << " ";
}
 
int main(int argc, char* argv[])
{
  try
    {
      TCLAP::CmdLine cmd(
        "Demonstrate BST split by position operation.\n"
        "Creates a tree and splits it at a given position.",
        ' ', "1.0");
 
      TCLAP::ValueArg<int> nArg("n", "count",
                                 "Number of elements",
                                 false, 10, "int");
      cmd.add(nArg);
 
      TCLAP::ValueArg<unsigned int> seedArg("s", "seed",
                                             "Random seed (0 = use time)",
                                             false, 0, "unsigned int");
      cmd.add(seedArg);
 
      TCLAP::ValueArg<int> posArg("p", "position",
                                   "Split position (-1 = middle)",
                                   false, -1, "int");
      cmd.add(posArg);
 
      cmd.parse(argc, argv);
 
      int n = nArg.getValue();
      unsigned int t = seedArg.getValue();
      int split_pos = posArg.getValue();
 
      if (n <= 0)
        {
          cerr << "Error: number of elements must be positive\n";
          return 1;
        }
 
      if (t == 0)
        t = time(nullptr);
 
      srand(t);
 
      cout << "=== BST Split by Position Demo ===" << endl;
      cout << "Elements: " << n << ", Seed: " << t << endl << endl;
 
      // Open output files
      output.open("split-before-aux.Tree", ios::out);
      output_1.open("split-1-aux.Tree", ios::out);
      output_2.open("split-2-aux.Tree", ios::out);
 
      if (!output.is_open() || !output_1.is_open() || !output_2.is_open())
        {
          cerr << "Error: cannot open output files" << endl;
          return 1;
        }
 
      // Build ranked tree
      Node* root = Node::NullPtr;
      int value;
 
      cout << "Building ranked BST with " << n << " elements..." << endl;
      for (int i = 0; i < n; i++)
        {
          while (true)
            {
              value = static_cast<int>(1.0 * n * rand() / (RAND_MAX + 1.0));
              if (searchInBinTree(root, value) == Node::NullPtr)
                break;
            }
          Node* p = new Node(value);
          insert_by_key_xt(root, p);
        }
 
      int num_nodes = root->getCount();
      cout << "  Nodes: " << num_nodes 
           << ", Height: " << computeHeightRec(root) << endl;
 
      assert(check_rank_tree(root));
      assert(check_bst(root));
 
      // Write original tree
      preOrderRec(root, &print_key);
 
      // Determine split position
      if (split_pos < 0 || split_pos >= num_nodes)
        split_pos = num_nodes / 2;
 
      cout << endl << "Splitting at position " << split_pos 
           << " (of " << num_nodes << ")..." << endl;
 
      // Add SPLIT directive for visualization
      output << "SPLIT " << split_pos << " \"\" \"\"" << endl;
 
      // Perform split
      Node* l;
      Node* r;
      split_pos_rec(root, split_pos, l, r);
      cout << "  ...done" << endl;
 
      // Verify and write left subtree
      if (l != Node::NullPtr)
        {
          assert(check_rank_tree(l));
          assert(check_bst(l));
          preOrderRec(l, print_key1);
          output_1 << endl;
          cout << endl << "Left subtree:" << endl;
          cout << "  Nodes: " << (l ? l->getCount() : 0) 
               << ", Height: " << computeHeightRec(l) << endl;
        }
      else
        {
          cout << endl << "Left subtree: empty" << endl;
        }
 
      // Verify and write right subtree
      if (r != Node::NullPtr)
        {
          assert(check_rank_tree(r));
          assert(check_bst(r));
          preOrderRec(r, print_key2);
          output_2 << endl;
          cout << "Right subtree:" << endl;
          cout << "  Nodes: " << (r ? r->getCount() : 0) 
               << ", Height: " << computeHeightRec(r) << endl;
        }
      else
        {
          cout << "Right subtree: empty" << endl;
        }
 
      // Clean up
      output.close();
      output_1.close();
      output_2.close();
      destroyRec(l);
      destroyRec(r);
 
      cout << endl << "Generated files:" << endl;
      cout << "  - split-before-aux.Tree (original with split directive)" << endl;
      cout << "  - split-1-aux.Tree (left subtree)" << endl;
      cout << "  - split-2-aux.Tree (right subtree)" << endl;
    }
  catch (TCLAP::ArgException& e)
    {
      cerr << "Error: " << e.error() << " for arg " << e.argId() << endl;
      return 1;
    }
 
  return 0;
}