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std::make_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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is_heap
is_heap_until(C++11)
make_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 make_heap( RandomIt first, RandomIt last );
(1)
template< class RandomIt, class Compare >

void make_heap( RandomIt first, RandomIt last,

                Compare comp );
(2)
Constrói uma pilha no [first, last) alcance. A primeira versão da função utiliza operator< comparar os elementos, o segundo usa a função de comparação dada 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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Índice

[editar] Parâmetros

first, last -
a gama de elementos para fazer a pilha de
Original:
the range of elements to make the heap from
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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.

[editar] Valor de retorno

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

Na maioria das comparações dos 3*std::distance(first, last).
Original:
At most 3*std::distance(first, last) comparisons.
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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::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

[editar] Veja também

vira um heap em um intervalo classificado de elementos
Original:
turns a heap into a sorted range of elements
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(modelo de função) [edit]