min heap priority queue c++
To implement a min heap priority queue in C++, you can follow these steps:
Include the necessary header file: Start by including the
<queue>
header file, which provides the necessary functionalities for implementing a priority queue.Declare the priority queue: Declare a priority queue object with the desired data type and compare function. For example, to create a min heap priority queue of integers, you can declare it as follows:
cpp std::priority_queue<int, std::vector<int>, std::greater<int>> minHeap;
Insert elements: Use the
push()
function to insert elements into the min heap priority queue. For example, to insert the element 5, you would write:cpp minHeap.push(5);
Access the top element: To access the smallest element (top element) in the min heap priority queue, you can use the
top()
function. For example:cpp int smallest = minHeap.top();
Remove the top element: To remove the smallest element from the min heap priority queue, use the
pop()
function. For example:cpp minHeap.pop();
Check if the priority queue is empty: You can use the
empty()
function to check if the min heap priority queue is empty. It returnstrue
if the priority queue is empty; otherwise, it returnsfalse
. For example:cpp if (minHeap.empty()) { // The priority queue is empty } else { // The priority queue is not empty }
Get the size of the priority queue: To get the number of elements in the min heap priority queue, use the
size()
function. For example:cpp int size = minHeap.size();
These steps will allow you to implement a min heap priority queue in C++. Remember to adjust the data type and compare function according to your specific requirements.