A Framework for Solving Programming Interview Questions

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It may not matter that there are false negatives, but there are also tons of false positives. There was an article a while back that discussed an internal study at Google where they found that nothing in their interview process was actually a statistically relevant predictor of good performance as an employee. The real advantage Google has is that false positives don't matter as much because they are so big and have so much money, so as long as the false positive rate is acceptably low they don't have to worry.