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669 A Serious Referee bitmasks brute force dfs and similar sortings Statement G Codeforces Global Round 15 {1552} PROGRAMMING 2500.0 Editorial of Global Round 15
5476 Small Operations binary search bitmasks brute force dfs and similar dp math number theory sortings Statement F Codeforces Round 1027 (Div. 3) {2114} PROGRAMMING 143268