Java: Reverse Last Half of Stack Using Recursion
What is the task in this Java problem?
You are given a stack with n integers. The task is to reverse the last half of the elements in the stack using recursion and print the updated stack.
How is the input provided in this problem?
The input format consists of an integer n representing the number of elements in the stack followed by n integers representing the elements themselves.
What should be the output of the Java program?
The output should be the stack with the last half of the elements reversed, printed in order from bottom to top.
Solution:
The Java code provided recursively reverses the last half of the elements in the stack and prints the updated stack. The code includes a missing closing brace for the main method, which has been added for completeness.
The code snippet defines a Java class named Source and includes a main method to execute the stack reversal logic. The reverseSecondHalf method is used to perform the actual reversal using recursion.
When the code is executed, it prompts the user to input the number of elements in the stack followed by the element values. The reverseSecondHalf method then reverses the last half of the elements, and the updated stack is printed.
The reversal process involves popping elements from the stack recursively until reaching the halfway point. At that point, the elements are reversed and put back into the stack to complete the reversal process.
Overall, this Java program demonstrates how recursion can be used to manipulate a stack data structure effectively, providing a practical example of recursive programming in Java.