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2597 Ring Road 2 2-sat dfs and similar ds graphs Statement D Codeforces Beta Round 27 (Codeforces format, Div. 2) {27} PROGRAMMING Solution of ABC @ Round#27 2300
2538 The Road to Berland is Paved With Good Intentions 2-sat dfs and similar ds graphs Statement E Codeforces Round 141 (Div. 2) {228} PROGRAMMING 2000
5221 The Door Problem 2-sat dfs and similar ds graphs Statement D ICM Technex 2017 and Codeforces Round 400 (Div. 1 + Div. 2, combined) {776} PROGRAMMING 2000