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5523 Asterism (Easy Version) brute force combinatorics implementation math number theory sortings Statement E1 Codeforces Round 654 (Div. 2) {1371} PROGRAMMING 1500.0 Codeforces Round #654 (Div. 2) Editorial
964 Serval and Music Game brute force combinatorics implementation math number theory Statement E Codeforces Round 853 (Div. 2) {1789} PROGRAMMING 2000.0 Codeforces Round #853 (Div. 2) Editorial