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5491 XOR-gun bitmasks brute force constructive algorithms Statement D Technocup 2021 - Elimination Round 2 {1415} PROGRAMMING 2000.0 Editorial of Codeforces Round 687 (Technocup 2021 — Elimitation Round 2)
21766 Cirno's Perfect Bitmasks Classroom bitmasks brute force constructive algorithms Statement A Codeforces Round 796 (Div. 2) {1688} PROGRAMMING 500.0 Tutorial