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25047 Number Game games math number theory Statement C Codeforces Round 651 (Div. 2) {1370} PROGRAMMING 1500.0 Editorial — Codeforces Round #651
12647 Deleting Divisors games math number theory Statement D Codeforces Round 726 (Div. 2) {1537} PROGRAMMING 1500.0 Codeforces Round #726 (Div.2) Editorial
50939 Game with Integers games math number theory Statement A Codeforces Round 909 (Div. 3) {1899} PROGRAMMING Разбор Codeforces Round 909 (Div. 3)
4200 Not a Nim Problem games math number theory Statement E Educational Codeforces Round 169 (Rated for Div. 2) {2004} PROGRAMMING