std::pop_heap

 

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機能します Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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all_of any_of none_of (C++11) (C++11) (C++11) for_each count count_if mismatch equal	find find_if find_if_not (C++11) find_end find_first_of adjacent_find search search_n
シーケンス動作を変更する Original: Modifying sequence operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
copy copy_if (C++11) copy_n (C++11) copy_backward move (C++11) move_backward (C++11) fill fill_n transform generate generate_n remove remove_if remove_copy remove_copy_if	replace replace_if replace_copy replace_copy_if swap swap_ranges iter_swap reverse reverse_copy rotate rotate_copy random_shuffle shuffle   (C++11) unique unique_copy
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is_partitioned (C++11) partition partition_copy (C++11)	stable_partition partition_point (C++11)
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is_sorted (C++11) is_sorted_until (C++11) sort	partial_sort partial_sort_copy stable_sort nth_element
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ヒープ操作 Original: Heap operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
is_heap is_heap_until (C++11) make_heap	push_heap pop_heap sort_heap
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qsort	bsearch

 

Defined in 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)

スワップポジションfirstの値と位置last-1の値とヒープにサブレンジ[first, last-1)になります。これは、範囲[first, last)によって定義されたヒープから最初の（最大の）要素を除去する効果を持っている.

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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関数の最初のバージョンは要素を比較するoperator<使用し、2番目はcomp与えられた比較関数を使用しています.

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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パラメータ

first, last	-	変更するには、有効な空のヒープを定義する要素の範囲 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	-	比較関数. 最初の値が二つ目の値より小さい 場合、 ​trueを返します. 比較関数のシグネチャは以下と同等でなければなりません.  bool cmp(const Type1 &a, const Type2 &b); シグネチャはconstを含まなくても構いませんが, 比較関数は渡されたオブジェクトを変更してはなりません. 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. ​
型の要件
- RandomIt は ValueSwappable and RandomAccessIterator。
- The type of dereferenced RandomIt must meet the requirements of MoveAssignable and MoveConstructible.

値を返します

(なし)

複雑性

せいぜい 2×log（n）の比較どこN=std::distance(first, last).

Original:

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

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ノート

'ヒープは、要素の範囲です[f,l)それは、次のプロパティがあります

Original:

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

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• *f範囲内の最大要素である

  Original:

  *f is the largest element in the range

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• 新しい要素がstd::push_heap()を使用して追加できます

  Original:

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

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• 最初の要素はstd::pop_heap()を用いて除去することができる

  Original:

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

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要素の実際の配置は、実装定義です.

Original:

The actual arrangement of the elements is implementation defined.

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例

このコードを実行します

#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 elementstd::cout<<"largest element: "<< largest <<'\n';   std::cout<<"heap without largest: ";for(auto i : v)std::cout<< i <<' ';std::cout<<'\n';}

出力:

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

参照

push_heap	ヒープに要素を追加します 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. (関数テンプレート)