std::make_heap

 

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is_heap is_heap_until (C++11) make_heap	push_heap pop_heap sort_heap
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definiert in Header <algorithm>
template<class RandomIt > void make_heap( RandomIt first, RandomIt last );	(1)
template<class RandomIt, class Compare > void make_heap( RandomIt first, RandomIt last,                 Compare comp );	(2)

Erzeugt ein Haufen im Bereich [first, last). Die erste Version der Funktion verwendet operator<, um die Elemente zu vergleichen, verwendet die zweite der angegebenen Vergleichsfunktion comp .

Original:

Constructs a heap in the range [first, last). The first version of the function uses operator< to compare the elements, the second uses the given comparison function comp.

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Parameter

first, last	-	das Spektrum der Elemente, um die Haufen aus zu machen Original: the range of elements to make the heap from The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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.

Rückgabewert

(None)

Original:

(none)

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Komplexität

An den meisten 3*std::distance(first, last) Vergleiche .

Original:

At most 3*std::distance(first, last) comparisons.

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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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Beispiel

#include <iostream>#include <algorithm>   int main(){std::vector<int> v {3, 1, 4, 1, 5, 9};   std::cout<<"initially, v: ";for(auto i : v)std::cout<< i <<' ';std::cout<<'\n';   std::make_heap(v.begin(), v.end());   std::cout<<"after make_heap, v: ";for(auto i : v)std::cout<< i <<' ';std::cout<<'\n';   std::pop_heap(v.begin(), v.end());auto largest = v.back(); v.pop_back();std::cout<<"largest element: "<< largest <<'\n';   std::cout<<"after removing the largest element, v: ";for(auto i : v)std::cout<< i <<' ';std::cout<<'\n';}

Output:

initially, v: 3 1 4 1 5 9 after make_heap, v: 9 5 4 1 1 3 largest element: 9 after removing the largest element, v: 5 3 4 1 1

Siehe auch

sort_heap	verwandelt einen Heap in eine sortierte Auswahl an Elementen Original: turns a heap into a sorted range of elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template)