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std::nth_element

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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
Original:
Partitioning operations
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Operações de classificação (em intervalos ordenados)
Original:
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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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 nth_element( RandomIt first, RandomIt nth, RandomIt last );
(1)
template< class RandomIt, class Compare >
void nth_element( RandomIt first, RandomIt nth, RandomIt last, Compare comp );
(2)
Parcialmente classifica a [first, last) intervalo em ordem crescente, de modo que todos os elementos da gama [first, nth) são' menos do que aqueles na faixa [nth, last). A primeira versão utiliza operator< para comparar os elementos, a segunda versão utiliza o comp dada função de comparação. O elemento colocado na posição nth é exactamente o elemento que iria ocorrer nesta posição, se o intervalo de variação foi totalmente resolvido.
Original:
Partially sorts the range [first, last) in ascending order so that all elements in the range [first, nth) are less than those in the range [nth, last). The first version uses operator< to compare the elements, the second version uses the given comparison function comp. The element placed in the nth position is exactly the element that would occur in this position if the range was fully sorted.
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Índice

[editar] Parâmetros

first, last -
aleatórios iteradores de acesso que definem o tipo intervalo
Original:
random access iterators defining the range sort
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nth -
iterador de acesso aleatório a definição do ponto de partição tipo
Original:
random access iterator defining the sort partition point
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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

Linear em std::distance(first, last) em média.
Original:
Linear in std::distance(first, last) on average.
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[editar] Exemplo

#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
 
int main()
{
    std::vector<int> v{5, 6, 4, 3, 2, 6, 7, 9, 3};
 
    std::nth_element(v.begin(), v.begin() + v.size()/2, v.end());
    std::cout << "The median is " << v[v.size()/2] << '\n';
 
    std::nth_element(v.begin(), v.begin()+1, v.end(), std::greater<int>());
    std::cout << "The second largest element is " << v[1] << '\n';
}

Output:

The median is 5
The second largest element is 7

[editar] Veja também

cópias e parcialmente Classifica um intervalo de elementos
Original:
copies and partially sorts a range of elements
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(modelo de função) [edit]
Classifica um intervalo de elementos preservando ordem entre elementos iguais
Original:
sorts a range of elements while preserving order between equal elements
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(modelo de função) [edit]
tipo um intervalo em ordem crescente
Original:
sorts a range into ascending order
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(modelo de função) [edit]