std::pop_heap

 

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Заголовочный файл <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)

Обмены значение в позиции first и значение в положении last-1 и делает поддиапазона [first, last-1) в куче'. Это имеет эффект удаления первый (самый большой) элемента из кучи определяется диапазон [first, last).

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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Первая версия функции используется operator< для сравнения элементов, второй использует данную функцию сравнения 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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Параметры

first, last	-	диапазон элементов, определяющих действительно куча непустое изменить Original: the range of elements defining the valid nonempty heap to modify The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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.

Возвращаемое значение

(Нет)

Original:

(none)

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Сложность

В большинстве 2 × журнала (N) сравнений, где N=std::distance(first, last).

Original:

At most 2×log(N) comparisons where N=std::distance(first, last).

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Notes

' Кучу целый ряд элементов [f,l), который имеет следующие свойства:

Original:

A heap is a range of elements [f,l) that has the following properties:

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• *f является крупнейшим элементом в ассортименте

  Original:

  *f is the largest element in the range

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• Новый элемент может быть добавлена ​​с помощью std::push_heap()

  Original:

  a new element can be added using std::push_heap()

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• Первый элемент можно удалить с помощью std::pop_heap()

  Original:

  the first element can be removed using std::pop_heap()

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Фактическое расположение элементов, определяется реализацией.

Original:

The actual arrangement of the elements is implementation defined.

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Пример

#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';
}

Вывод:

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

См. также

push_heap	добавляет элемент в кучу Original: adds an element to a heap The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (шаблон функции)