What Is the technology Used By CODECHEF to Catch cheaters and people who copy paste the code?

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What Is the technology Used By CODECHEF to Catch cheaters and people who copy paste the code?

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its MOSS and codechef uses it …

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Codechef uses MOSS (Measure Of Software Similarity) for plagiarism detection which is an automatic system for determining the similarity of programs.

You can find about MOSS here: http://theory.stanford.edu/~aiken/moss/

And to know how it works just download this PDF

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Codechef uses moss to detect plagiarism.

Read in deatil here - https://theory.stanford.edu/~aiken/moss/