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2358 National Property 2-sat dfs and similar graphs implementation Statement C Codeforces Round 441 (Div. 1, by Moscow Team Olympiad) {875} PROGRAMMING Codeforces Round #441. Editorial. 2100
1809 Columns Swaps 2-sat dfs and similar dsu graphs implementation Statement G Codeforces Round 656 (Div. 3) {1385} PROGRAMMING Codeforces Round #656 (Div. 3) Editorial 2300
877 One-Four Overload 2-sat constructive algorithms dfs and similar geometry graphs implementation Statement F Codeforces Round 742 (Div. 2) {1567} PROGRAMMING 2750.0 Codeforces Round #742 Editorial