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std::inplace_merge

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< cpp‎ | algorithm

 
 
アルゴリズムライブラリ
機能します
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Functions
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シーケンス動作を非改変
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Non-modifying sequence operations
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シーケンス動作を変更する
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Modifying sequence operations
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操作を仕切る
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Partitioning operations
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(ソートされた範囲で)ソート操作
Original:
Sorting operations (on sorted ranges)
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バイナリ検索操作(ソート範囲で)
Original:
Binary search operations (on sorted ranges)
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(ソートされた範囲で)操作を設定します
Original:
Set operations (on sorted ranges)
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merge
inplace_merge
includes
ヒープ操作
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Heap operations
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最小値/最大値操作
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Minimum/maximum operations
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数値演算
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Numeric operations
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Cライブラリ
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C library
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Defined in header <algorithm>
template< class BidirIt >
void inplace_merge( BidirIt first, BidirIt middle, BidirIt last );
(1)
template< class BidirIt, class Compare>
void inplace_merge( BidirIt first, BidirIt middle, BidirIt last, Compare comp );
(2)
[first, middle)[middle, last)1ソート範囲[first, last)に2つの連続した​​並べ替えの範囲をマージします。等しい要素の順序は保持されることが保証されている。最初のバージョンは、要素を比較するoperator<使用して、2番目のバージョンは、指定された比較関数compを使用しています.
Original:
Merges two consecutive sorted ranges [first, middle) and [middle, last) into one sorted range [first, last). The order of equal elements is 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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目次

[編集] パラメータ

first -
最初にソート範囲の先頭
Original:
the beginning of the first sorted range
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middle -
最初にソート範囲と第2の始まりの終わり
Original:
the end of the first sorted range and the beginning of the second
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last -
第二ソート範囲の終わり
Original:
the end of the second sorted range
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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 BidirIt can be dereferenced and then implicitly converted to both of them. ​

型の要件
-
BidirItValueSwappable and BidirectionalIterator
-
The type of dereferenced BidirIt must meet the requirements of MoveAssignable and MoveConstructible.

[編集] 値を返します

(なし)
Original:
(none)
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[編集] 複雑

まさにN-1比較に十分な追加メモリが使用可能であれば、そうでなければN·log(N)どこN = std::distance(first, last).
Original:
Exactly N-1 comparisons if enough additional memory is available, otherwise N·log(N) where N = std::distance(first, last).
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[編集] ノート

この関数は、一般的にstd::get_temporary_bufferを呼び出すことによって、一時的なバッファを割り当てようとします。割り当てが失敗した場合は、あまり効率的なアルゴリズムが選ばれ.
Original:
This function attempts to allocate a temporary buffer, typically by calling std::get_temporary_buffer. If the allocation fails, the less efficient algorithm is chosen.
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[編集]

次のコードはマージソートを実装したものです.
Original:
The following code is an implementation of merge sort.
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#include <vector>
#include <iostream>
#include <algorithm>
 
template<class Iter>
void merge_sort(Iter first, Iter last)
{
    if (last - first > 1) {
        Iter middle = first + (last - first) / 2;
        merge_sort(first, middle);
        merge_sort(middle, last);
        std::inplace_merge(first, middle, last);
    }
}
 
int main()
{
    std::vector<int> v{8, 2, -2, 0, 11, 11, 1, 7, 3};
    merge_sort(v.begin(), v.end());
    for(auto n : v) {
        std::cout << n << ' ';
    }
    std::cout << '\n';
}

出力:

-2 0 1 2 3 7 8 11 11

[編集] も参照してください

2つのソートされた範囲をマージします
Original:
merges two sorted ranges
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(関数テンプレート) [edit]
昇順にソートする範囲
Original:
sorts a range into ascending order
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(関数テンプレート) [edit]
ソートされた範囲の要素を等しい要素間の順序を維持しながら
Original:
sorts a range of elements while preserving order between equal elements
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(関数テンプレート) [edit]