Founded in 1958, CSUFT has developed into a multidisciplinary university comprising a wide range of disciplines in science, engineering, agriculture, arts, law, economics, management and education, and has been authorized to offer a comprehensive range of programs including bachelor, master, doctor’s programs and post-doctoral programs. Since its foundation, the university has turned out over 160,000 talents. CSUFT is located in the national historical and cultural city : Changsha.
The above is the history of our school. The next is the description of this problem ^_^.
Giving n numbers,Cyl want to find the answer how many pairs of these numbers meet the condition of Ai *2 = Aj (i < j). Please you tell him.
Please note that there are many groups of samples.