std::push_heap
来自cppreference.com
该页由英文版wiki使用Google Translate机器翻译而来。
该翻译可能存在错误或用词不当。鼠标停留在文本上可以看到原版本。你可以帮助我们修正错误或改进翻译。参见说明请点击这里. |
在头文件 <algorithm> 中定义
|
||
template< class RandomIt > void push_heap( RandomIt first, RandomIt last ); |
(1) | |
template< class RandomIt, class Compare > void push_heap( RandomIt first, RandomIt last, |
(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
.原文:
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
.目录 |
[编辑] 参数
first, last | - | 范围定义堆修改的元素
原文: the range of elements defining the heap to modify |
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. |
类型要求 | ||
-RandomIt 必须满足 RandomAccessIterator 的要求。
| ||
-The type of dereferenced RandomIt must meet the requirements of MoveAssignable and MoveConstructible .
|
[编辑] 返回值
(无)
[编辑] 复杂度
在大多数日志“2×(N)”比较N=std::distance(first, last).
原文:
At most 2×log(N) comparisons where N=std::distance(first, last).
[编辑] 注释
A“堆”是一个范围的元素
[f,l)
具有以下属性:原文:
A heap is a range of elements
[f,l)
that has the following properties:- *f范围中的最大元素原文:*f is the largest element in the range
- 可以添加一个新的元素,使用std::push_heap()原文:a new element can be added using std::push_heap()
- 使用std::pop_heap()的第一个元素可以被删除原文:the first element can be removed using std::pop_heap()
-
实际配置是实现定义的元素.
原文:
The actual arrangement of the elements is implementation defined.
[编辑] 示例
#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'; }
输出:
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
[编辑] 另请参阅
将堆中的最大元素删除 (函数模板) |