Easy Peasy, Lemon Squeezy

Let’s consider an array $A$ which is initially empty. We’ll perform two types of operation on that array:

This is a companion discussion topic for the original entry at https://toph.co/p/easy-peasy-lemon-squeezy

Which Data Structure need for solve this problem.

please update the problem statement @hjr265

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@rkb_rd Done. The problem statement has been updated. Equations should render correctly now.

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