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14051 Longest Regular Bracket Sequence constructive algorithms data structures dp greedy sortings strings Statement C Codeforces Beta Round 5 {5} PROGRAMMING C, D и E с CBR5 - разбор 1900
16597 Letters Rearranging constructive algorithms greedy sortings strings Statement B Educational Codeforces Round 56 (Rated for Div. 2) {1093} PROGRAMMING 63877 900