numbers 1 to 17 in 17x17 square table
Source: 2015 Grand Duchy of Lithuania, Mathematical Contest p3 (Baltic Way TST)
October 3, 2020
combinatoricssquare table
Problem Statement
A table consists of squares. In each square one positive integer from to is written, every such number is written in exactly squares. Prove that there is a row or a column of the table that contains at least different numbers.