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We are very sorry to hear that you've had a negative experience in our process. For background, we have have hundreds of candidates taking these Codility coding tests and it acts as our first stage of screening candidates. Whilst you may see that your code passes the tests made available on the platform, when you submit your solution Codility runs many more tests on your code behind the scenes in order to 'grade' the level of robustness of your code (and subjecting it to a number of edge cases in terms of input). When a candidate's submission fails the robustness tests to a level below our minimum code quality standards, we inform the recruiters that the submission fell short. We never give recruiters detailed feedback on Codility tests in order to protect the integrity of the test for future candidates.
Candidate experience is very important to us at Marshall Wace. We apologize if all of this wasn't made clear to you from the recruiter managing your process.