std::pop_heap

 

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all_of any_of none_of (C++11) (C++11) (C++11) for_each count count_if mismatch equal	find find_if find_if_not (C++11) find_end find_first_of adjacent_find search search_n
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copy copy_if (C++11) copy_n (C++11) copy_backward move (C++11) move_backward (C++11) fill fill_n transform generate generate_n remove remove_if remove_copy remove_copy_if	replace replace_if replace_copy replace_copy_if swap swap_ranges iter_swap reverse reverse_copy rotate rotate_copy random_shuffle shuffle   (C++11) unique unique_copy
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Defined in header <algorithm>
template< class RandomIt > void pop_heap( RandomIt first, RandomIt last );	(1)
template< class RandomIt, class Compare > void pop_heap( RandomIt first, RandomIt last, Compare comp );	(2)

Intercambia el valor en la posición first y el valor en la posición last-1 y hace que el [first, last-1) subrango en un montón'. Esto tiene el efecto de eliminar la primera (la más grande) elemento de la pila definida por el intervalo [first, last) .

Original:

Swaps the value in the position first and the value in the position last-1 and makes the subrange [first, last-1) into a heap. This has the effect of removing the first (largest) element from the heap defined by the range [first, last).

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La primera versión de la función utiliza operator< para comparar los elementos, el segundo utiliza la función de comparación dado comp .

Original:

The first version of the function uses operator< to compare the elements, the second uses the given comparison function comp.

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Parámetros

first, last	-	la gama de elementos que definen la pila no vacía válido para modificar Original: the range of elements defining the valid nonempty heap to modify 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 ValueSwappable and RandomAccessIterator.
- The type of dereferenced RandomIt must meet the requirements of MoveAssignable and MoveConstructible.

Valor de retorno

(Ninguno)

Original:

(none)

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Complejidad

A lo sumo 2 × log (N) comparaciones N=std::distance(first, last) donde .

Original:

At most 2×log(N) comparisons where N=std::distance(first, last).

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Notas

Un montón' es una serie de elementos [f,l) que tiene las siguientes propiedades:

Original:

A heap is a range of elements [f,l) that has the following properties:

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• *f es el elemento más grande en el intervalo

  Original:

  *f is the largest element in the range

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• un elemento nuevo puede añadirse utilizando std::push_heap()

  Original:

  a new element can be added using std::push_heap()

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• el primer elemento se puede eliminar con std::pop_heap()

  Original:

  the first element can be removed using std::pop_heap()

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La disposición real de los elementos depende de la implementación .

Original:

The actual arrangement of the elements is implementation defined.

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Ejemplo

#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';
 
    std::pop_heap(v.begin(), v.end()); // moves the largest to the end
 
    std::cout << "after pop_heap: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
 
    int largest = v.back();
    v.pop_back();  // actually removes the largest element
    std::cout << "largest element: " << largest << '\n';
 
    std::cout << "heap without largest: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
}

Output:

v: 9 5 4 1 1 3 
after pop_heap: 5 3 4 1 1 9 
largest element: 9
heap without largest: 5 3 4 1 1

Ver también

push_heap	añade un elemento a un montón Original: adds an element to a heap The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función de plantilla)