Please explain the answer given, 2-3-5-6-9 Algorithm main() {stack = new Stack()
ID: 2079981 • Letter: P
Question
Please explain the answer given, 2-3-5-6-9
Algorithm main() {stack = new Stack() stack.push(5) stack.push(3) stack.push(9) stack.push(2) stack.push(6) mysteryFunction(stack) while !stack.isEmpty() {System.out.printIn(stack.top() + "-") stack.pop()}} Function mysteryFunction(Stack stack) {if stack.isEmpty() {return} Integer top = stack.top() stack.pop() mysteryFunction(stack) theOtherMysteryFunction(top, stack) return} Function theOthertlysteryFunction(Integer top, Stack stack) {(stack.isEmpty() || stack.top() >= top) {stack.push(top) return} Integer smaller = stack.top() stack.pop() theOtherMysteryFunction(top, stack) stack.push(smaller)} Once computed, what will this algorithm print out? Please choose one: a) 5-3-9-2-6 b) 2-3-5-6-9Explanation / Answer
In the main algorithm:
stack.push(5)
stack.push(3)
stack.push(9)
stack.push(2)
stack.push(6)
after the execution of these instructions the status of the stack will be:
6<-stack top
2
9
3
5
1) Now, the mystery function is called:
In the mystery function
2) if stack.isEmpty condition is false since the stack is not empty. So this if loop is skipped.
3) On running the remaining instructions in the function value 6 is assigned to variable 'top' and the is popped out.
4) Now, another function 'theOtherMysteryFunction' is called.
5) It checks whether the new top of stack is greater than the value assigned to the variable 'top'
In this case 2 is not greater than 6. thus further process of pushing it again onto the stack is skipped.
the status of stack:
2<-stack top
9
3
5
top<-6
Now the whole process is repeated.
New top of stack is 2.
it is assigned to the variable smaller and the stack is popped
Now this function is again called for the new stack.
once again the stack.top(i.e. 2) iscompared with top(i.e 6)
this time the condition is satisfied the value 6 is pushed onto the stack
Now, the status of stack:
6<-stack top
9
3
5
smaller<-2
In such a way, the whole stack is sorted i ascending order.
2-3-5-6-9