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Discussion of Problem 1738. Computer Security

not clear statements
Posted by Ivan Lakhtin`~ 9 Jun 2019 19:00
For those who as I has wa3 or wa5 and don't understand why:
1) similar must be personal number, not passwords
2) personal number is decimal number
3) to get other password (i.e. calculate diffeence of passwords) we can ONLY change digit, we can't insert or erase digits like in personal number
May be you don't have theese mistakes, but I spent a day to undestand it