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Stacks And Queues

Stacks and queues are linear data structures.

They both store items in order, but they remove items in different ways.

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Fast Idea

Structure Rule
Stack Last In, First Out (LIFO)
Queue First In, First Out (FIFO)
Priority Queue Higher-priority item gets served first

Real-Life Picture

  • Stack: pile of plates
  • Queue: line of people
  • Circular Queue: chairs around a round table
  • Priority Queue: emergency patients, where urgent cases go first

See Also

For side-by-side differences, read Comparison.

For diagram-heavy notes, read Visual Comparison.