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Data Structures for Coding Interviews in C++

Challenge: Implement Two Stacks Using One Array

Explore how to implement two stacks using a single array with fixed size, supporting independent push and pop operations for each stack. Understand the design challenges and optimize space usage by sharing one array for both stacks without resizing.

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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. ...