This person is just using hard coded solutions to solve problems. You can check his recent solutions and see.
Determine whether a vector is monotonically increasing
Tic Tac Toe FTW
How many trades represent all the profit?
Sum of series VII
It's going down. We're finding simbers!
A (wrong) place for everything, and everything in its (wrong) place
Breaking Out of the Matrix
Pseudo Square Root (Inspired by Project Euler 266)
Return elements unique to either input
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