Strange problem

Revision en1, by rek, 2017-01-02 17:35:35

Hello, Codeforces!

Recently I stumbled upon a certain problem. Given n pairwise distinct positive integers (let's say all of them are less than or equal to 109), you're ought to find such k that these numbers modulo k will still be pairwise distinct.

I'll be thankful if someone suggests a non-naive solution (i.e. w/o explicitly calculating all the pairwise differences) or provides some ideas to start with.

Tags number theory


  Rev. Lang. By When Δ Comment
en2 English rek 2017-01-02 19:15:53 18 Tiny change: 'find such $k$ that ' -> 'find such smallest possible $k$ that '
en1 English rek 2017-01-02 17:35:35 439 Initial revision for English translation
ru1 Russian rek 2017-01-02 17:34:27 454 Первая редакция (опубликовано)