Prefix trie problems

Правка en1, от question_id, 2015-07-31 12:25:30

I need some problems that can be solved using prefix tree/trie in codeforces. I tried tag option to find from problemset menu but it doesn't work.

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en1 Английский question_id 2015-07-31 12:25:30 167 Initial revision (published)