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Sort an stack using another stack

Golu Rawat answered on August 24, 2022 Popularity 6/10 Helpfulness 2/10

answer Sort an stack using another stack

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Sort an stack using another stack

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public class Solution {
    public ArrayList<Integer> solve(ArrayList<Integer> A) {
        
        Stack<Integer> input_stack = new Stack<>();
        input_stack.addAll(A);
        Stack<Integer> sorted_stack = new Stack<>();
        
        while(!input_stack.isEmpty()){
            
            int top = input_stack.pop();
            insertInStack(sorted_stack, top);
        }
        
        return new ArrayList<>(sorted_stack);
    }
    
    private void insertInStack(Stack<Integer> sorted_stack, int temp){
        
        if(sorted_stack.isEmpty() || sorted_stack.peek() >= temp){
            sorted_stack.push(temp);
            return;
        }
        
        int top = sorted_stack.pop();
        insertInStack(sorted_stack, temp);
        sorted_stack.push(top);
    }
}
JavaCopy

Popularity 6/10 Helpfulness 2/10 Language java

Source: iq.opengenus.org

Tags: java stack using

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Contributed on Aug 24 2022

Golu Rawat

0 Answers Avg Quality 2/10

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Sort an stack using another stack

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// Java program to sort a stack using
// a auxiliary stack.
import java.util.*;
 
class SortStack
{
    // This function return the sorted stack
    public static Stack<Integer> sortstack(Stack<Integer>
                                             input)
    {
        Stack<Integer> tmpStack = new Stack<Integer>();
        while(!input.isEmpty())
        {
            // pop out the first element
            int tmp = input.pop();
         
            // while temporary stack is not empty and
            // top of stack is greater than temp
            while(!tmpStack.isEmpty() && tmpStack.peek()
                                                 > tmp)
            {
                // pop from temporary stack and
                // push it to the input stack
            input.push(tmpStack.pop());
            }
             
            // push temp in temporary of stack
            tmpStack.push(tmp);
        }
        return tmpStack;
    }
     
    // Driver Code
    public static void main(String args[])
    {
        Stack<Integer> input = new Stack<Integer>();
        input.add(34);
        input.add(3);
        input.add(31);
        input.add(98);
        input.add(92);
        input.add(23);
     
        // This is the temporary stack
        Stack<Integer> tmpStack=sortstack(input);
        System.out.println("Sorted numbers are:");
     
        while (!tmpStack.empty())
        {
            System.out.print(tmpStack.pop()+" ");
        }
    }
}
// This code is contributed by Danish Kaleem

Popularity 6/10 Helpfulness 1/10 Language whatever

Source: www.geeksforgeeks.org

Tags: whatever stack using

Link to this answer
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Contributed on Aug 24 2022

Golu Rawat

0 Answers Avg Quality 2/10

Sort an stack using another stack

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