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std::partial_sort

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< cpp‎ | algorithm

 
 
Bibliothèque d'algorithmes
Fonctions
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Functions
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Non-modification de la séquence des opérations
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Non-modifying sequence operations
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Modification de la séquence des opérations
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Modifying sequence operations
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Des opérations de partitionnement
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Partitioning operations
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Opérations de tri (sur les gammes triés)
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Sorting operations (on sorted ranges)
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is_sorted (C++11)
is_sorted_until (C++11)
sort
Opérations binaires de recherche (sur les gammes triés)
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Binary search operations (on sorted ranges)
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Définir les opérations (sur les gammes triés)
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Set operations (on sorted ranges)
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Opérations Heap
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Heap operations
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Minimum / maximum de fonctionnement
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Minimum/maximum operations
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Opérations numériques
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Numeric operations
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Bibliothèque 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)
Sortes de certains éléments dans la gamme [first, last) dans l'ordre croissant. middle - first la première de ces éléments sont placés dans la gamme [first, middle). L'ordre des éléments égaux n'est pas garanti d'être préservé. L'ordre des éléments restants dans la gamme [middle, last) n'est pas spécifié. La première version utilise operator< de comparer les éléments, la deuxième version utilise la fonction de comparaison donnée 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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Sommaire

[modifier] Paramètres

first, last -
la plage d'éléments à trier
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.

[modifier] Retourne la valeur

(Aucun)
Original:
(none)
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[modifier] Complexité

O(N·log2(N)), où les applications N = std::distance(first, last) de cmp. Si la mémoire supplémentaire est disponible, alors la complexité est 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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[modifier] Exemple

#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 << " ";
    } 
}

Résultat :

0 1 2 7 8 6 5 9 4 3

[modifier] Voir aussi

copies et partiellement Trie une plage d'éléments
Original:
copies and partially sorts a range of elements
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(fonction générique) [edit]
Trie une plage d'éléments, tout en préservant l'ordre entre des éléments égaux
Original:
sorts a range of elements while preserving order between equal elements
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(fonction générique) [edit]
trie une plage dans l'ordre ascendant
Original:
sorts a range into ascending order
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(fonction générique) [edit]