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25527 Anna and the Valentine's Day Gift games greedy math sortings Statement E Codeforces Round 925 (Div. 3) {1931} PROGRAMMING 125878
16651 Everything Nim games greedy math sortings Statement A Codeforces Round 941 (Div. 1) {1965} PROGRAMMING 500.0 Codeforces Round #941 (Div. 1, Div. 2) Editorial 1400