How should I decide which problems to choose for solving in Codeforces?

Правка en1, от lnzva, 2015-07-14 12:38:43

When I'm practising, I'm not sure how to choose the difficulty of the problem that I should attempt.

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en1 Английский lnzva 2015-07-14 12:38:43 171 Initial revision (published)