Sudheer S - 2 months ago 6

Java Question

I have a Stack variable (java collection) which holds five integers and I was also given one int variable. Is it possible to sort the numbers in the given stack. I am not able to solve that. Please post here if you have ideas.

`Stack<Integer> s = new Stack<Integer>();`

s.push(5);s.push(3);s.push(4);s.push(1);s.push(1);

int a;

Answer

Here i found the perfect answer from geeksforgeeks which uses recursion. http://www.geeksforgeeks.org/sort-a-stack-using-recursion/ Just posting the same algorithm here.

**Algorithm:**

**We can use below algorithm to sort stack elements:**

```
sortStack(stack S)
if stack is not empty:
temp = pop(S);
sortStack(S);
sortedInsert(S, temp);
```

**Below algorithm is to insert element is sorted order:**

```
sortedInsert(Stack S, element)
if stack is empty OR element > top element
push(S, elem)
else
temp = pop(S)
sortedInsert(S, element)
push(S, temp)
```