Quarantine Shelter

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Due to rapid spread of corona virus Ramanujam Hostel of IET Lucknow is supposed to be made quarantine shelter. There are $N$ rooms in a row and exactly $k$ rooms have to be acquired. But for maintaining social distancing among people, any two adjacent rooms cannot be acquired (i.e. if $i-th$ room is acquired, then $(i+1)-th$ room and $(i-1)-th$ room must be free). You are the best math

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solution.cppC++17

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