Intelligent question - horse racing question

subject ：36 horse , Six tracks , At least how many times can you pick out the top three （ The result of every race is the same ）

answer ：8 Time
Their thinking :

Want every horse to race , At least six times in six groups . In this way, you can know the ranking of each group . Obviously , In each group 4,5, 6 Not even the top three in this group , So it's a direct elimination , It is impossible to get into the final top three .
At this time, we let the first place of each group play once , Determine the first place in each group , The first place you get at this time must be the first , But the top three are not necessarily the final top three , At this time, the second place in the second place group may be better than the third place .（ It's like high school classes , The 20th place in the rocket class may be better than the first place in the parallel class ）
So at this time, the top three of the group in which the first place is located, the top two of the group in which the second place is located and the third place will be competed once , At this time, the top three are the final top three .

Ape friends can refer to the following pictures for reference ：