push_heap

將位於範圍結尾為包含在這個範圍中現有的任何前置的項目中加入項目。

template<class RandomAccessIterator>
   void push_heap(
      RandomAccessIterator _First, 
      RandomAccessIterator _Last
   );
template<class RandomAccessIterator, class BinaryPredicate>
   void push_heap(
      RandomAccessIterator _First, 
      RandomAccessIterator _Last,
      BinaryPredicate _Comp
   );

參數

• _First
  解決的隨機存取 Iterator 的第一個項目位置在堆疊的頂端。

• _Last
  解決的隨機存取 Iterator 超過最後一個項目的位置是在要轉換的範圍為堆疊。

• _Comp
  定義感受遠遠之使用者定義的述詞函式物件哪一個項目小於另一個。 一個二進位述詞採用兩個引數並傳回 true ，當內容和 false ，則內容。

備註

必須先推入項目至現有堆疊結尾演算法可用來將這個項目加入至現有的堆積。

中有兩個屬性:

• 第一個項目永遠是最大。

• 項目在某個時間可能會加入或移除。

堆疊是理想的方式實作優先權佇列，並且可用於標準樣板程式庫 (STL) 容器配置器 priority_queue 類別的實作。

參考的範圍必須是有效的，任何指標必須 dereferenceable，並在序列中最後一個位置開始可取得的會增加。

除了新加入的元素範圍會在結尾必須是堆疊。

複雜度是對數的需求，最多只記錄 (_Last – _First) 比較。

範例

// alg_push_heap.cpp
// compile with: /EHsc
#include <vector>
#include <algorithm>
#include <functional>
#include <iostream>

int main( ) {
   using namespace std;
   vector <int> v1, v2;
   vector <int>::iterator Iter1, Iter2;

   int i;
   for ( i = 1 ; i <= 9 ; i++ )
      v1.push_back( i );

   random_shuffle( v1.begin( ), v1.end( ) );

   cout << "Vector v1 is ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")." << endl;

   // Make v1 a heap with default less than ordering
   make_heap ( v1.begin( ), v1.end( ) );
   cout << "The heaped version of vector v1 is ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")." << endl;

   // Add an element to the heap
   v1.push_back( 10 );
   cout << "The heap v1 with 10 pushed back is ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")." << endl;

   push_heap( v1.begin( ), v1.end( ) );
   cout << "The reheaped v1 with 10 added is ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")." << endl << endl;

   // Make v1 a heap with greater than ordering
   make_heap ( v1.begin( ), v1.end( ), greater<int>( ) );
   cout << "The greater-than heaped version of v1 is\n ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")." << endl;

   v1.push_back(0);
   cout << "The greater-than heap v1 with 11 pushed back is\n ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")." << endl;

   push_heap( v1.begin( ), v1.end( ), greater<int>( ) );
   cout << "The greater than reheaped v1 with 11 added is\n ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")." << endl;
}

範例輸出

Vector v1 is ( 9 2 7 3 1 6 8 4 5 ).
The heaped version of vector v1 is ( 9 5 8 4 1 6 7 2 3 ).
The heap v1 with 10 pushed back is ( 9 5 8 4 1 6 7 2 3 10 ).
The reheaped v1 with 10 added is ( 10 9 8 4 5 6 7 2 3 1 ).

The greater-than heaped version of v1 is
 ( 1 2 6 3 5 8 7 4 10 9 ).
The greater-than heap v1 with 11 pushed back is
 ( 1 2 6 3 5 8 7 4 10 9 0 ).
The greater than reheaped v1 with 11 added is
 ( 0 1 6 3 2 8 7 4 10 9 5 ).

需求

標題: <algorithm>

命名空間: std

請參閱

參考

heap

標準樣板程式庫