dial_example.cc

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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
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 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
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*/
 
# include <iostream>
# include <iomanip>
# include <aleph.H>
# include <tpl_graph.H>
# include <Dial.H>
 
using namespace Aleph;
using namespace std;
 
using Node_Info = char;
using Arc_Info = int;
using GT = List_Graph<Graph_Node<Node_Info>, Graph_Arc<Arc_Info>>;
 
int main()
{
  cout << "=== Dial's Algorithm Example ===" << endl << endl;
 
  GT g;
 
  auto a = g.insert_node('A');
  auto b = g.insert_node('B');
  auto c = g.insert_node('C');
  auto d = g.insert_node('D');
  auto e = g.insert_node('E');
  auto f = g.insert_node('F');
 
  g.insert_arc(a, b, 2);
  g.insert_arc(a, c, 3);
  g.insert_arc(b, d, 1);
  g.insert_arc(b, e, 3);
  g.insert_arc(c, e, 2);
  g.insert_arc(d, f, 2);
  g.insert_arc(e, f, 2);
 
  cout << "Delivery network with small integer weights:" << endl
       << "  A ---(2)---> B ---(1)---> D ---(2)---> F" << endl
       << "  |            |                          ^" << endl
       << " (3)          (3)                        (2)" << endl
       << "  |            |                          |" << endl
       << "  v            v                          |" << endl
       << "  C ---(2)---> E -------------------------+" << endl << endl;
 
  Dial_Min_Paths<GT> dial;
 
  dial.paint_min_paths_tree(g, a);
 
  cout << "Shortest distances from A:" << endl;
  cout << left << setw(10) << "Node" << setw(8) << "Hours" << endl;
  cout << setfill('-') << setw(18) << "-" << setfill(' ') << endl;
 
  for (auto it = g.get_node_it(); it.has_curr(); it.next())
    {
      auto node = it.get_curr();
      auto dist = dial.get_distance(node);
      cout << left << setw(10) << (char)node->get_info()
           << setw(8) << dist << endl;
    }
 
  cout << endl << "=== Performance ===" << endl
       << "Time:  O(V + E + C)" << endl
       << "Space: O(V + C)" << endl;
 
  return 0;
}