SE-SKOLORNAS 1982 Problem 5
Each point in a array is colored red, white or blue. Show that it is always possible to find points of the same color forming a rectangle with sides parallel to the sides of the array.
Dataset text AI-MO AoPS. Quoted with source.
Solutions
No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.
Similar problems
These problems have the most words in common with this statement.