std::push_heap

 

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Defined in header <algorithm>
template< class RandomIt > void push_heap( RandomIt first, RandomIt last );	(1)
template< class RandomIt, class Compare > void push_heap( RandomIt first, RandomIt last,                 Compare comp );	(2)

插入的位置处的元素到所定义的范围内last-1堆[first, last-1)。 operator<的第一个版本的功能使用比较的元素，第二个使用给定的比较函数comp.

Original:

Inserts the element at the position last-1 into the heap defined by the range [first, last-1). The first version of the function uses operator< to compare the elements, the second uses the given comparison function comp.

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参数

first, last	-	范围定义堆修改的元素 Original: the range of elements defining the 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 RandomAccessIterator.
- The type of dereferenced RandomIt must meet the requirements of MoveAssignable and MoveConstructible.

返回值

（无）

Original:

(none)

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复杂性

在大多数日志“2×（N）”比较N=std::distance(first, last).

Original:

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

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注释

A“堆”是一个范围的元素[f,l)具有以下属性：

Original:

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

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• *f范围中的最大元素

  Original:

  *f is the largest element in the range

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• 可以添加一个新的元素，使用std::push_heap()

  Original:

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

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• 使用std::pop_heap()的第一个元素可以被删除

  Original:

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

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实际配置是实现定义的元素.

Original:

The actual arrangement of the elements is implementation defined.

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为例

#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';
 
    v.push_back(6);
 
    std::cout << "before push_heap: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
 
    std::push_heap(v.begin(), v.end());
 
    std::cout << "after push_heap: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
}

Output:

v: 9 5 4 1 1 3 
before push_heap: 9 5 4 1 1 3 6 
after push_heap:  9 5 6 1 1 3 4

另请参阅

pop_heap	从堆的最大元素中删除 Original: removes the largest element from a heap The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）