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std::pop_heap

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< cpp‎ | algorithm

 
 
Biblioteca algoritmo
Funções
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Functions
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Não modificar operações de seqüência
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Non-modifying sequence operations
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Modificando operações de seqüência
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Modifying sequence operations
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Particionamento operações
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Partitioning operations
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Operações de classificação (em intervalos ordenados)
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Sorting operations (on sorted ranges)
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Binários operações de busca (em intervalos ordenados)
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Binary search operations (on sorted ranges)
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Definir operações (em intervalos ordenados)
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Set operations (on sorted ranges)
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Operações de pilha
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Heap operations
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push_heap
pop_heap
sort_heap
Mínimo / máximo de operações
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Minimum/maximum operations
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Operações numéricas
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Numeric operations
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C biblioteca
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C library
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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)
Trocas valor no first posição e o valor no last-1 posição e faz com que o sub-intervalo [first, last-1) num montão'. Isto tem o efeito de remover o elemento (o maior), primeiro a partir da pilha definido pela gama [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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A primeira versão da função utiliza operator< comparar os elementos, o segundo usa a função de comparação dada 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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Índice

[editar] Parâmetros

first, last -
a gama de elementos que definem a pilha não vazia válido para modificar
Original:
the range of elements defining the valid nonempty 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 ValueSwappable and RandomAccessIterator.
-
The type of dereferenced RandomIt must meet the requirements of MoveAssignable and MoveConstructible.

[editar] Valor de retorno

(Nenhum)
Original:
(none)
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[editar] Complexidade

No máximo 2 × log (N) comparações onde N=std::distance(first, last).
Original:
At most 2×log(N) comparisons where N=std::distance(first, last).
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[editar] Notas

Uma pilha' é uma gama de elementos [f,l) que tem as seguintes propriedades:
Original:
A heap is a range of elements [f,l) that has the following properties:
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  • *f é o maior elemento no intervalo
    Original:
    *f is the largest element in the range
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  • um novo elemento pode ser adicionado usando std::push_heap()
    Original:
    a new element can be added using std::push_heap()
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  • o primeiro elemento pode ser removido usando std::pop_heap()
    Original:
    the first element can be removed using std::pop_heap()
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O real disposição dos elementos é definido pela implementação.
Original:
The actual arrangement of the elements is implementation defined.
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[editar] Exemplo

#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

[editar] Veja também

acrescenta um elemento a um heap
Original:
adds an element to a heap
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(modelo de função) [edit]