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Data Structures for Coding Interviews in Java

Challenge: Implement Two Stacks Using One Array

Explore how to design and implement a data structure that supports two stacks sharing one array. Understand how to perform push and pop operations for both stacks efficiently in Java, all while maintaining a fixed array size and working in-place without resizing. This lesson helps you grasp a common coding interview challenge related to stack management and array handling.

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Statement

Design a data structure TwoStacks, that represents two stacks using a single array, where both stacks share the same array for storing elements.

The following operations must be supported:

  • push1(value): Takes an integer value and inserts it into the first stack.

  • push2(value): Takes an integer value and inserts it into the second stack.

  • pop1(): Removes the top element from the first stack and returns it.

  • pop2(): Removes the top element from the second stack and returns it.

Note: Perform all operations in-place without resizing the underlying list, maintaining a fixed size throughout. ...