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Question: simple data structure in java can anyone help with this...
Question details
simple Data Structure in Java。
can anyone help with this question?
![[5 marks] Read the input one line at a time and output the current line if and only if it is a duplicate of some previous line](https://homework-api-assets-production.s3.ap-southeast-2.amazonaws.com/uploads/store/681227027/16015951663691249369155d47ac28b239556df354.png)
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