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2132 Ants in Leaves dfs and similar greedy sortings trees Statement E Educational Codeforces Round 7 {622} PROGRAMMING Editorial of Educational Codeforces Round 7 2300
20952 Linova and Kingdom dfs and similar dp greedy sortings trees Statement A Codeforces Round 635 (Div. 1) {1336} PROGRAMMING 500.0 Codeforces Round #635 Editorial 1700