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std::push_heap

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C++
 
Algorithm Bibliothek
Funktionen
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Functions
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Nicht-modifizierende Sequenz Operationen
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Non-modifying sequence operations
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Modifizierende Sequenz Operationen
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Modifying sequence operations
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Partitionierungsoperationen
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Partitioning operations
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Sortierung Operationen (auf sortierten Bereiche)
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Sorting operations (on sorted ranges)
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Binary Suchaktionen (auf sortierten Bereiche)
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Binary search operations (on sorted ranges)
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Set-Operationen (auf sortierten Bereiche)
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Set operations (on sorted ranges)
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Heap-Operationen
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Heap operations
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push_heap
pop_heap
sort_heap
Minimum / Maximum Operationen
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Minimum/maximum operations
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Numerische Operationen
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Numeric operations
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C-Bibliothek
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C library
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definiert in Header <algorithm>
template< class RandomIt >
void push_heap( RandomIt first, RandomIt last );
 (1)
template< class RandomIt, class Compare >

void push_heap( RandomIt first, RandomIt last,

                Compare comp );
 (2)
Fügt das Element an der Position last-1 in den Haufen durch die Reichweite [first, last-1) definiert. Die erste Version der Funktion verwendet operator<, um die Elemente zu vergleichen, verwendet die zweite der angegebenen Vergleichsfunktion comp .
Original:
Inserts the element at the position last-1 into the heap defined by the range [first, last-1). The first version of the function uses operator< to compare the elements, the second uses the given comparison function comp.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

first, last -
das Spektrum der definierenden Elemente der Haufen zu ändern
Original:
the range of elements defining the heap to modify
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comp - comparison function which returns ​true if the first argument is less than the second.

The signature of the comparison function should be equivalent to the following:

 bool cmp(const Type1 &a, const Type2 &b);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The types Type1 and Type2 must be such that an object of type RandomIt can be dereferenced and then implicitly converted to both of them. ​

Type requirements
-
RandomIt must meet the requirements of RandomAccessIterator.
-
The type of dereferenced RandomIt must meet the requirements of MoveAssignable and MoveConstructible.

[Bearbeiten] Rückgabewert

(None)
Original:
(none)
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[Bearbeiten] Komplexität

An den meisten 2 × log (N) Vergleiche, wo N=std::distance(first, last) .
Original:
At most 2×log(N) comparisons where N=std::distance(first, last).
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[Bearbeiten] Notes

A Haufen ist ein Bereich von Elementen [f,l) das hat die folgenden Eigenschaften:
Original:
A heap is a range of elements [f,l) that has the following properties:
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  • *f ist das größte Element in dem Bereich
    Original:
    *f is the largest element in the range
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  • ein neues Element hinzugefügt mit std::push_heap() werden
    Original:
    a new element can be added using std::push_heap()
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  • das erste Element kann mit Hilfe std::pop_heap() werden
    Original:
    the first element can be removed using std::pop_heap()
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Die tatsächliche Anordnung der Elemente ist die Umsetzung definiert .
Original:
The actual arrangement of the elements is implementation defined.
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[Bearbeiten] Beispiel

#include <iostream>
#include <algorithm>
 
int main()
{
    std::vector<int> v { 3, 1, 4, 1, 5, 9 };
 
    std::make_heap(v.begin(), v.end());
 
    std::cout << "v: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
 
    v.push_back(6);
 
    std::cout << "before push_heap: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
 
    std::push_heap(v.begin(), v.end());
 
    std::cout << "after push_heap: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
}

Output: 

v: 9 5 4 1 1 3 
before push_heap: 9 5 4 1 1 3 6 
after push_heap:  9 5 6 1 1 3 4

[Bearbeiten] Siehe auch
Entfernt das größte Element aus einem Haufen
Original:
removes the largest element from a heap
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