Editorial for Another Contest 4 Problem 3 - An Isosceles Right Triangle

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.

The function you are to implement is to return true iff the number is a square, as clued by the problem statement and the titles to problems 3 and 4.


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