Qwerty the XORty

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Qwerty is stuck in admin and wants to leave outside to finish his tasks, In order to open the door, an infinite counter is provided for him to set a number. The infinite counter is provided with an initial value of $0$, you can either increase or decrease the count value by $1$, every turn. At any given instance the value of the counter should be a non-negative integer. In order to open the door

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solution.cppC++17

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