priorityQueue -- create a new PriorityQueue

• Usage:

  Q = priorityQueue()

  Q = priorityQueue L

• Inputs:
  • L, a list, a list of comparable elements
• Outputs:
  • Q, an instance of the type PriorityQueue, a priority queue storing the elements of L

i1 : Q = priorityQueue {1,5,2,-3,0}

o1 = PriorityQueue{...4...}

o1 : PriorityQueue

i2 : min Q

o2 = -3