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std::pop_heap

De cppreference.com
< cpp‎ | algorithm
 
 
Biblioteca de algoritmos
Políticas de ejecución (C++17)
Operaciones no modificadoras de secuencia
(C++11)(C++11)(C++11)
(C++17)
Operaciones modificadoras de secuencia
Operaciones en almacenamiento no inicializado
Operaciones de partición
Operaciones de ordenación
(C++11)
Operaciones de búsqueda binaria
Operaciones de set (en rangos ordenados)
Operaciones de pila
(C++11)
pop_heap
Operaciones minimo/maximo
(C++11)
(C++17)
Permutaciones
Operaciones numéricas
Bibliotecas C
 
Definido en la cabecera <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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Contenido

[editar] 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
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comp - comparison function object (i.e. an object that satisfies the requirements of Compare) 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);

While the signature does not need to have const &, the function must not modify the objects passed to it and must be able to accept all values of type (possibly const) Type1 and Type2 regardless of value category (thus, Type1 & is not allowed, nor is Type1 unless for Type1 a move is equivalent to a copy (desde C++11)).
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. ​

Requerimientos de tipo
-
RandomIt debe reunir los requerimientos de ValueSwappable y RandomAccessIterator.
-
The type of dereferenced RandomIt must meet the requirements of MoveAssignable and MoveConstructible.

[editar] Valor de retorno

(Ninguno)
Original:
(none)
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[editar] 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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[editar] 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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[editar] 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';
}

Salida:

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

[editar] Ver también

añade un elemento a un montón
Original:
adds an element to a heap
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(plantilla de función) [editar]