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std::partial_sort_copy

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)
partial_sort_copy
Operaciones de búsqueda binaria
Operaciones de set (en rangos ordenados)
Operaciones de pila
(C++11)
Operaciones minimo/maximo
(C++11)
(C++17)
Permutaciones
Operaciones numéricas
Bibliotecas C
 
Definido en la cabecera <algorithm>
template< class InputIt, class RandomIt >

RandomIt partial_sort_copy( InputIt first, InputIt last,

                            RandomIt d_first, RandomIt d_last );
(1)
template< class InputIt, class RandomIt, class Compare >

RandomIt partial_sort_copy( InputIt first, InputIt last,
                            RandomIt d_first, RandomIt d_last,

                            Compare comp );
(2)
Ordena de algunos de los elementos en el rango [first, last) en orden ascendente. En la mayoría d_first - d_last de los elementos se mueven a la [d_first, d_first + n) rango y luego ordenados. n es el número de elementos a ordenar (n = min(last - first, d_last - d_first)). El orden de los elementos iguales no se garantiza que se mantendrá. La primera versión utiliza operator< para comparar los elementos, la segunda versión utiliza la función de comparación dado comp .
Original:
Sorts some of the elements in the range [first, last) in ascending order. At most d_first - d_last of the elements are moved to the range [d_first, d_first + n) and then sorted. n is the number of elements to sort (n = min(last - first, d_last - d_first)). The order of equal elements is not guaranteed to be preserved. The first version uses operator< to compare the elements, the second version uses the given comparison function comp.
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Contenido

[editar] Parámetros

first, last -
la gama de elementos a ordenar
Original:
the range of elements to sort
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d_first, d_last -
iteradores de acceso aleatorio que definen el rango de destino
Original:
random access iterators defining the destination range
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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. ​

Requerimientos de tipo
-
InputIt debe reunir los requerimientos de InputIterator.
-
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

un iterador al elemento que define el límite superior del rango ordenados, es decir d_first + min(last - first, d_last - d_first) .
Original:
an iterator to the element defining the upper boundary of the sorted range, i.e. d_first + min(last - first, d_last - d_first).
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[editar] Complejidad

O(N·log(min(D,N)), donde N = std::distance(first, last), D = std::distance(d_first, d_last) aplicaciones de cmp .
Original:
O(N·log(min(D,N)), where N = std::distance(first, last), D = std::distance(d_first, d_last) applications of cmp.
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[editar] Ejemplo

En el código siguiente un vector de enteros y los copia en una más pequeña y un vector grande .
Original:
The following code sorts an vector of integers and copies them into a smaller and a larger vector.
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#include <algorithm>
#include <vector>
#include <functional>
#include <iostream>
 
int main()
{
    std::vector<int> v0{4, 2, 5, 1, 3};
    std::vector<int> v1{10, 11, 12};
    std::vector<int> v2{10, 11, 12, 13, 14, 15, 16};
    std::vector<int>::iterator it;
 
    it = std::partial_sort_copy(v0.begin(), v0.end(), v1.begin(), v1.end());
 
    std::cout << "Writing to the smaller vector in ascending order gives: ";
    for (int a : v1) {
        std::cout << a << " ";
    }
    std::cout << '\n';
    if(it == v1.end())
        std::cout << "The return value is the end iterator\n";
 
    it = std::partial_sort_copy(v0.begin(), v0.end(), v2.begin(), v2.end(), 
                                std::greater<int>());
 
    std::cout << "Writing to the larger vector in descending order gives: ";
    for (int a : v2) {
        std::cout << a << " ";
    }
    std::cout << '\n' << "The return value is the iterator to " << *it << '\n';
}

Salida:

Writing to the smaller vector in ascending order gives: 1 2 3
The return value is the end iterator
Writing to the larger vector in descending order gives: 5 4 3 2 1 15 16
The return value is the iterator to 15

[editar] Ver también

ordena los primeros n elementos de un rango
Original:
sorts the first N elements of a range
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(plantilla de función) [editar]
Ordena un intervalo en orden ascendente
Original:
sorts a range into ascending order
The text has been machine-translated via Google Translate.
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(plantilla de función) [editar]
Ordena un intervalo de elementos, mientras que la preservación del orden entre los elementos iguales
Original:
sorts a range of elements while preserving order between equal elements
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(plantilla de función) [editar]