src/work/bin_heap_demo.cc
author klao
Wed, 15 Sep 2004 14:25:44 +0000
changeset 858 acc83957ee4a
parent 274 28728f3945c5
child 921 818510fa3d99
permissions -rw-r--r--
Handling strings with std::string
Do not segfault if srcdir env. variable is not set.
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#include <iostream>
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#include <string>
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#include <map>
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#include <hugo/bin_heap.h>
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using namespace hugo;
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using namespace std;
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class string_int_map;
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// Egy binaris kupac, ami stringekhez rendelt double ertekeket tarol,
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// azaz mindig az a string van a tetejen, amihez a legkisebb szam tartozik.
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// A kupac egy string_int_map tipusu property_map segitsegevel tarolja
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// a stringek aktualis helyet sajatmagan belul.
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// Egy olyan stringhez, ami meg nincsen a kupac -1 -et kell rendelnunk.
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typedef BinHeap<string, double, string_int_map> StrDoubleHeap;
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class string_int_map : public map<string,int> {
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  typedef map<string,int> parent;
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public:
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  int get(const string &s) {
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    // Bocs, ez igy gaaaany, de nem volt kedvem utananezni, hogy
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    // hogy is mukodik ez a map :)
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    if( count(s) == 0 ) {
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      parent::operator[](s) = StrDoubleHeap::PRE_HEAP;
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    }
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    return parent::operator[](s);
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  }
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  int operator[](const string &s) {
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    return get(s);
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  }
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  void set(const string &s, int i) {
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      parent::operator[](s) = i;
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  }
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};
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int main()
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{
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  string_int_map sim;
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  cout << "testing string_int_map default value:\n";
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  cout << "  sim.get(\"alma\"): " << sim.get("alma") << endl;
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  cout << "  sim[\"alma\"]: " << sim["alma"] << endl;
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  cout << "creating the heap\n";
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  StrDoubleHeap heap(sim);
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  cout << "heap.push(\"alma\", 15);\n";
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  heap.push("alma", 15);
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  cout << "heap.set(\"korte\", 3.4);\n";
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  heap.set("korte", 3.4);
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  cout << "heap[\"alma\"] = " 
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       << heap["alma"]
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       << endl;
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  cout << "heap.top() = "
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       << heap.top() << endl;
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  cout << "heap.prio() = "
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       << heap.prio() << endl;
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  cout << "heap.decrease(\"alma\", 1.2);\n";
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  heap.set("alma", 1.2);
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  cout << "heap.top() = "
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       << heap.top() << endl;
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  cout << "heap.prio() = "
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       << heap.prio() << endl;
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  cout << "heap.set(\"alma\", 22);\n";
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  heap.set("alma", 22);
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  cout << "heap.top() = "
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       << heap.top() << endl;
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  cout << "heap.prio() = "
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       << heap.prio() << endl;
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  cout << "heap.size() = "
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       << heap.size() << endl;
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  cout << "heap.pop();\n";
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  heap.pop();
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  cout << "heap.top() = "
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       << heap.top() << endl;
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  cout << "heap.prio() = "
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       << heap.prio() << endl;
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  cout << "heap.state(\"szilva\") = "
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       << heap.state("szilva") << endl;
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  cout << "heap.set(\"szilva\", 0.5);\n";
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  heap.set("szilva", 0.5);
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  cout << "heap.state(\"szilva\") = "
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       << heap.state("szilva") << endl;
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  cout << "heap.top() = "
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       << heap.top() << endl;
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  cout << "heap.pop();\n";
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  heap.pop();
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  cout << "heap.state(\"szilva\") = "
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       << heap.state("szilva") << endl;
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  cout << "heap.size() = "
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       << heap.size() << endl;
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  cout << "heap.pop();\n";
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  heap.pop();
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  cout << "heap.size() = "
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       << heap.size() << endl;  
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  cout << "heap.empty() = "
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       << (heap.empty()?"true":"false") << endl;  
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}