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std::partial_sort_copy

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< cpp‎ | algorithm

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C++
 
Algoritmo libreria
Funzioni
Original:
Functions
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Non modifica le operazioni di sequenza
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Non-modifying sequence operations
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Modifica delle operazioni di sequenza
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Modifying sequence operations
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Partizionamento operazioni
Original:
Partitioning operations
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Ordinamento delle operazioni (su intervalli ordinati)
Original:
Sorting operations (on sorted ranges)
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Binarie (le operazioni di ricerca sui campi ordinati)
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Binary search operations (on sorted ranges)
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Impostare le operazioni (su intervalli ordinati)
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Set operations (on sorted ranges)
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Heap operazioni
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Heap operations
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Minimo / massimo le operazioni
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Minimum/maximum operations
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Operazioni numeriche
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Numeric operations
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Libreria C
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C library
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Elemento definito nell'header <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)
Ordina alcuni degli elementi della [first, last) intervallo in ordine crescente. Al massimo d_first - d_last degli elementi vengono spostati nella [d_first, d_first + n) gamma e quindi ordinati. n è il numero di elementi da ordinare (n = min(last - first, d_last - d_first)). L'ordine degli elementi uguali non è garantito per essere preservato. La prima versione utilizza operator< di confrontare gli elementi, la seconda versione utilizza la funzione di confronto dato 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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Indice

[modifica] Parametri

first, last -
la gamma di elementi da ordinare
Original:
the range of elements to sort
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d_first, d_last -
iteratori ad accesso casuale che definiscono il campo di destinazione
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. ​

Type requirements
-
InputIt must meet the requirements of InputIterator.
-
RandomIt must meet the requirements of ValueSwappable and RandomAccessIterator.
-
The type of dereferenced RandomIt must meet the requirements of MoveAssignable and MoveConstructible.

[modifica] Valore di ritorno

un iteratore per l'elemento che definisce il limite superiore del campo ordinato, vale a dire 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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[modifica] Complessità

O(N·log(min(D,N)), dove N = std::distance(first, last), D = std::distance(d_first, d_last) applicazioni di 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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[modifica] Esempio

Il codice seguente ordina un vettore di numeri interi e li copia in un piccolo e un vettore più 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';
}

Output: 

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

[modifica] Vedi anche
ordina i primi n elementi di un intervallo
Original:
sorts the first N elements of a range
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(funzione di modello) [modifica]
ordina una serie in ordine crescente
Original:
sorts a range into ascending order
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(funzione di modello) [modifica]
Ordina un intervallo di elementi, mantenendo ordine tra elementi uguali
Original:
sorts a range of elements while preserving order between equal elements
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(funzione di modello) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/algorithm/partial_sort_copy&oldid=24968"