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std::pop_heap

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< cpp‎ | algorithm

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C++
 
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)
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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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push_heap
pop_heap
sort_heap
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 RandomIt >
void pop_heap( RandomIt first, RandomIt last );
 (1)
template< class RandomIt, class Compare >
void pop_heap( RandomIt first, RandomIt last, Compare comp );
 (2)
Swap il valore nella first posizione e il valore nella last-1 posizione e rende il [first, last-1) sottointervallo in un' heap. Questo ha l'effetto di eliminare la prima (più grande) elemento dall'heap definito dal [first, last) gamma.
Original:
Swaps the value in the position first and the value in the position last-1 and makes the subrange [first, last-1) into a heap. This has the effect of removing the first (largest) element from the heap defined by the range [first, last).
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La prima versione della funzione utilizza operator< per confrontare gli elementi, il secondo utilizza la funzione di confronto dato comp.
Original:
The first version of the function uses operator< to compare the elements, the second uses the given comparison function comp.
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Indice

[modifica] Parametri

first, last -
la gamma di elementi che definiscono l'heap valido non vuoto da modificare
Original:
the range of elements defining the valid nonempty heap to modify
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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

Al massimo 2 × log (N) confronti N=std::distance(first, last) dove.
Original:
At most 2×log(N) comparisons where N=std::distance(first, last).
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[modifica] Note

Un mucchio' è una serie di elementi [f,l) che ha le seguenti proprietà:
Original:
A heap is a range of elements [f,l) that has the following properties:
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  • *f è l'elemento più grande della gamma
    Original:
    *f is the largest element in the range
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  • un nuovo elemento può essere aggiunto utilizzando std::push_heap()
    Original:
    a new element can be added using std::push_heap()
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  • il primo elemento può essere rimosso utilizzando std::pop_heap()
    Original:
    the first element can be removed using std::pop_heap()
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L'effettiva disposizione degli elementi è definita attuazione.
Original:
The actual arrangement of the elements is implementation defined.
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[modifica] Esempio

#include <iostream>
#include <algorithm>
 
int main()
{
    std::vector<int> v { 3, 1, 4, 1, 5, 9 };
 
    std::make_heap(v.begin(), v.end());
 
    std::cout << "v: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
 
    std::pop_heap(v.begin(), v.end()); // moves the largest to the end
 
    std::cout << "after pop_heap: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
 
    int largest = v.back();
    v.pop_back();  // actually removes the largest element
    std::cout << "largest element: " << largest << '\n';
 
    std::cout << "heap without largest: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
}

Output: 

v: 9 5 4 1 1 3 
after pop_heap: 5 3 4 1 1 9 
largest element: 9
heap without largest: 5 3 4 1 1

[modifica] Vedi anche
aggiunge un elemento a un heap
Original:
adds an element to a heap
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(funzione di modello) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/algorithm/pop_heap&oldid=24973"