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std::partial_sort_copy

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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 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)
Sortes de certains éléments dans la gamme [first, last) dans l'ordre croissant. Au plus d_first - d_last des éléments sont déplacés vers le large [d_first, d_first + n) puis triés. n est le nombre d'éléments à trier (n = min(last - first, d_last - d_first)). L'ordre des éléments égaux n'est pas garanti d'être préservé. 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. 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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Sommaire

[modifier] Paramètres

first, last -
la plage d'éléments à trier
Original:
the range of elements to sort
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d_first, d_last -
itérateurs d'accès aléatoire définissant la plage de destination
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.

[modifier] Retourne la valeur

un itérateur de l'élément définissant la limite supérieure de la plage triés, soit 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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[modifier] Complexité

O(N·log(min(D,N)), où N = std::distance(first, last), D = std::distance(d_first, d_last) applications 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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[modifier] Exemple

Le code suivant trie un vecteur d'entiers et les copie dans un plus petit et un plus grand vecteur .
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';
}

Résultat :

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

[modifier] Voir aussi

trie les n premiers éléments d'une gamme
Original:
sorts the first N elements of a range
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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]
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]