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sutu192002
2 năm trước
Trong dãy bây giờ có N người,có không ít hơn a người đứng trước tôi và không nhiều hơn b người đứng sau tôi,hãy thử đếm xem có bao nhiêu vị trí mà tôi có thể đứng trong dãy. Vd: 3 1 1 in ra 2
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