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4304 Perfect Security data structures greedy strings trees Statement C VK Cup 2018 - Round 1 {923} PROGRAMMING 1900
1484 Short Code data structures dp greedy strings trees Statement E Codeforces Round 476 (Div. 2) [Thanks, Telegram!] {965} PROGRAMMING Analysis of Codeforces Round #476 (Div. 2) [Thanks, Telegram!] 2500