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521 Omkar and Pies bitmasks dfs and similar dp math Statement G Codeforces Global Round 10 {1392} PROGRAMMING 3000.0 Codeforces Global Round 10 — Editorial
869 Set bitmasks brute force combinatorics dfs and similar divide and conquer dp math Statement F Codeforces Round 947 (Div. 1 + Div. 2) {1975} PROGRAMMING 2500.0 editorial_zh.pdf 2600