The Standard Template Library defines a specialized form of the queue<> container called priority_queue<>. A priority_queue is a queue whose elements are internally sorted according to their priority. Thus, an element with the highest priority is located at the top. To qualify as an element of priority_queue<>, an object has to define the < operator. For example:
#include // definition of less<> #include // definition of priority_queue<>#include using namespace std;struct Task{ int priority; friend bool operator < (const Task& t1, const Task& t2); Task(int p=0) : priority(p) {} };bool operator < (const Task& t1, const Task& t2) { return t1.priority < t2.priority;}int main(){ priority_queue scheduler; scheduler.push(Task(3)); scheduler.push(Task(5)); scheduler.push(Task(1)); cout<< scheduler.top().priority < 
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