Editorial for Mock CCC '22 1 S5 - Berkeley Math Tournament Awards Ceremony

Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.

There is no intended solution for the subtask.

For a given 2D residue, either there is exactly zero, one, or infinitely many squares realizable. Furthermore, in the infinite case, either all squares are possible or they all lie on some line.


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