Codevita Plagarism Detection

I have heard a lot of people saying that they solved 3, 4 or 5 problems in codevita and still didn’t qualify (claiming to not have cheated) while the one who solved only 1 problem qualified. Is there anyone who got selected even after solving 3 or more problems. How does TCS judges a code to be classified as plagiarized cause a lot of people can go with the same approach for a problem