330 seats in the first row of the auditorium
Source: 2021 Saudi Arabia Training Lists p36 https://artofproblemsolving.com/community/c2758131_2021_saudi_arabia_training_tests
January 5, 2022
combinatorics
Problem Statement
There are seats in the first row of the auditorium. Some of these seats are occupied by viewers. Prove that among the pairwise distances between these viewers, there are two equal.