c++中对的优先级队列(先排序)
在 C++中， priority_queue 实现堆。以下是创建对类型的优先级队列的一些示例。
按第一个元素排序的最大优先级队列(或最大堆)
// C++ program to create a priority queue of pairs.
// By default a max heap is created ordered
// by first element of pair.
#include <bits/stdc++.h>
using namespace std;
// Driver program to test methods of graph class
int main()
{
// By default a max heap is created ordered
// by first element of pair.
priority_queue<pair<int, int> > pq;
pq.push(make_pair(10, 200));
pq.push(make_pair(20, 100));
pq.push(make_pair(15, 400));
pair<int, int> top = pq.top();
cout << top.first << " " << top.second;
return 0;
}
输出:
20 100
按第一个元素排序的最小优先级队列(或最小堆)
// C++ program to create a priority queue of pairs.
// We can create a min heap by passing adding two
// parameters, vector and greater().
#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pi;
// Driver program to test methods of graph class
int main()
{
// By default a min heap is created ordered
// by first element of pair.
priority_queue<pi, vector<pi>, greater<pi> > pq;
pq.push(make_pair(10, 200));
pq.push(make_pair(20, 100));
pq.push(make_pair(15, 400));
pair<int, int> top = pq.top();
cout << top.first << " " << top.second;
return 0;
}
输出:
10 200
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