Qiao Yu didn't intend to get a high score in the preliminary round; he would be satisfied as long as he passed because, according to the competition rules, the preliminary scores had nothing to do with the finals.
However, when the time came, and Qiao Yu opened the question bank, he smiled.
For example, the first question fell under the category of combinatorial geometry, covering plane geometry, combinatorics, visibility graphs, and so on. The problem involved line-of-sight obstruction, and from Qiao Yu's understanding of mathematics, this usually appeared in computational geometry.
But this was a multiple-choice question.
Honestly, Qiao Yu was not boasting; multiple-choice questions were what he did best.
He didn't even need to draw diagrams; by merely reasoning through the pre-arranged points and the visibility issues, he could deduce that the number of people involved could not exceed 6, thus eliminating option D.
