Qualification round page - https://www.facebook.com/hackercup/problems.php?round=146094915502528
Countdown - http://fb.me/1glVt0CnM
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Qualification round page - https://www.facebook.com/hackercup/problems.php?round=146094915502528
Countdown - http://fb.me/1glVt0CnM
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It's over!
Many people talk about it in russian, but there is no good solutions at this moment. Some people have O(n) solutions as i know, with using minimum query for sufixes and/or prefixes, instead of [L, R] queries.