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1581 Petya and Spiders bitmasks dp dsu Statement C Codeforces Beta Round 85 (Div. 1 Only) {111} PROGRAMMING Codeforces Beta Round #85: Разбор задач 2100
2172 Kuro and GCD and XOR and SUM binary search bitmasks brute force data structures dp dsu greedy math number theory strings trees Statement D Codeforces Round 482 (Div. 2) {979} PROGRAMMING 1750.0 Codeforces Round #482 (Div. 2) Editorial 2200
1372 Kuroni and Antihype bitmasks dp dsu graphs Statement G Ozon Tech Challenge 2020 (Div.1 + Div.2, Rated, T-shirts + prizes!) {1305} PROGRAMMING 3250.0 Ozon Tech Challenge 2020 Editorial 3300