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18633 Weird Sum combinatorics data structures geometry math matrices sortings Statement A Codeforces Round 775 (Div. 1, based on Moscow Open Olympiad in Informatics) {1648} PROGRAMMING 500.0 Codeforces Round #775 Editorial
1371 Fractal Origami combinatorics geometry math matrices Statement C Codeforces Round 921 (Div. 1) {1924} PROGRAMMING 1500.0 Codeforces Round 921 (Div. 1, Div. 2) Editorial