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2199 Board Game games greedy implementation math Statement C VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) {533} PROGRAMMING Разбор VK Cup Round 2 1700
1050 Lamps on a Circle games greedy implementation interactive math Statement F Codeforces Global Round 8 {1368} PROGRAMMING 3000.0 Codeforces Global Round 8: editorial