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std::partial_sort

Da cppreference.com.
< cpp‎ | algorithm

 
 
Algoritmo libreria
Funzioni
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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
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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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Defined in header <algorithm>
template< class RandomIt >
void partial_sort( RandomIt first, RandomIt middle, RandomIt last );
(1)
template< class RandomIt, class Compare >
void partial_sort( RandomIt first, RandomIt middle, RandomIt last, Compare comp );
(2)
Ordina alcuni degli elementi della [first, last) intervallo in ordine crescente. La middle - first primo di questi elementi vengono inseriti nella [first, middle) gamma. L'ordine degli elementi uguali non è garantito per essere preservato. L'ordine degli elementi rimanenti nella [middle, last) campo non è specificato. 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. The first middle - first of these elements are placed in the range [first, middle). The order of equal elements is not guaranteed to be preserved. The order of the remaining elements in the range [middle, last) is unspecified. 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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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.

[modifica] Valore di ritorno

(Nessuno)
Original:
(none)
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[modifica] Complessità

O(N·log2(N)), in cui le applicazioni di N = std::distance(first, last) cmp. Se la memoria aggiuntiva è disponibile, la complessità è O(N·log(N))
Original:
O(N·log2(N)), where N = std::distance(first, last) applications of cmp. If additional memory is available, then the complexity is O(N·log(N))
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[modifica] Esempio

#include <algorithm>
#include <functional>
#include <array>
#include <iostream>
 
int main()
{
    std::array<int, 10> s{5, 7, 4, 2, 8, 6, 1, 9, 0, 3};
 
    std::partial_sort(s.begin(), s.begin() + 3, s.end());
    for (int a : s) {
        std::cout << a << " ";
    } 
}

Output:

0 1 2 7 8 6 5 9 4 3

[modifica] Vedi anche

copie e parzialmente ordina una serie di elementi
Original:
copies and partially sorts a range of elements
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(funzione di modello) [edit]
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) [edit]
ordina una serie in ordine crescente
Original:
sorts a range into ascending order
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(funzione di modello) [edit]