C1014 Interesting!

"Wait, let me digest this!"

Ye Mo said when Lee Shuyun paused.

Actually, Lee Shuyun didn't explain it very clearly, but at least it was close to what Ye Mo had guessed.

For example, take a piece of A 4 paper to indicate the ground, and mark the page header and footer as A and B, respectively, representing the distance between the two places on the ground