How Can I hack a submission ?

Revision en1, by Ahnaf.Shahriar.Asif, 2017-08-25 18:57:36

Hello everybody . I have got some problems . In the last contest I solved a problem within 11 minutes . But someone hacked my submission . I still have no idea about hacking a submission . Please help me . How can I hack others' submission ? And how or why they can hack mine ? If there anyone who can help me ?????

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en1 English Ahnaf.Shahriar.Asif 2017-08-25 18:57:36 345 Initial revision (published)