Define Priority Queue. Explain Application and implementation of Priority Queue ? 

Explain Multiple stacks ?

Explain briefly Infix expression, Polish Notation and Reverse Polish Notation ?

Explain Conversion to Infix expression to Postfix expression

Explain Ackermann function in details ?

Define stacks. Explain various operation of stacks ? 

Explain about Implementation of Queue ? 

Explain simple queue ? Brief disadvantages of simple queue.