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Atom is tired of using Notepad or Eclipse to code Java. He wants to create his own text editor. Initially, Atoms editor contains an empty string S. He wishes his editor to perform following type of operations: 1. Append (W) – Appends string W to the end of S. 2. Delete (k) – Deletes the last k characters from S. 3. Print (k) – Prints the kth character of S. 4. Undo() – Undo the last operation

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solution.cppC++17

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