The problems are designed to be solvable with pencil, paper, and human reasoning.
In Physics problems, using a calculator is encouraged to arrive at a correct decimal answer.
For Mathematics problems, solutions that use computer programs are considered valid if you can justify why there was no error in your computation.
In general, if you find yourself wanting to brute force an answer with a computer, there is probably a more elegant way to go about it that you are not seeing.
Still have questions? Reach us at support@brilliant.org.