When the interrogative is also the subject we don't use an auxiliary.
Who saw you? ( subject question) Who did you see ( object question)
You can practise this grammar point on these links:
http://www.oup.com/elt/global/products/englishfile/preint/a_grammar/file02/grammar02_c01/
http://www.oup.com/elt/global/products/englishfile/preint/a_grammar/file02/grammar02_c02/
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