Amazon questions

  • 1

    Compare two expressions
    (a+b) + c = c + a + b
    -(a+b-c) = c -b -a

    Design Twitter trending topics

    Design Elevator system

    Deep copy of linked list

  • 0

    Not quite understand the purpose of "comparing two expressions".

    regarding the Elevator system, i guess that main purpose is to check the requirement clarification capability.

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