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1466 Leaf Sets data structures dfs and similar dsu graphs greedy sortings trees Statement F Codeforces Round 510 (Div. 2) {1042} PROGRAMMING Tutorial 2400
5737 Passable Paths (hard version) bitmasks data structures dfs and similar dp sortings trees Statement G2 Codeforces Round 805 (Div. 3) {1702} PROGRAMMING 104763
6316 Passable Paths (easy version) data structures dfs and similar sortings trees Statement G1 Codeforces Round 805 (Div. 3) {1702} PROGRAMMING 104763
3999 Unusual Entertainment data structures dfs and similar dsu shortest paths sortings trees Statement G Codeforces Round 909 (Div. 3) {1899} PROGRAMMING Разбор Codeforces Round 909 (Div. 3)
43 Burenka and Pether *special data structures dfs and similar divide and conquer dsu graphs sortings trees Statement C XVIII Open Olympiad in Informatics - Final Stage, Day 2 (Unrated, Online Mirror, IOI rules) {1940} PROGRAMMING
827 Remove Bridges data structures dfs and similar dp greedy sortings trees Statement F Educational Codeforces Round 166 (Rated for Div. 2) {1976} PROGRAMMING Educational Codeforces Round 166 Editorial
9526 Tree Pruning brute force data structures dfs and similar greedy sortings trees Statement C Codeforces Round 975 (Div. 1) {2018} PROGRAMMING 750.0 Editorial of Codeforces Round 975 (Div. 1, Div. 2)
2677 Penchick and Chloe's Trees data structures dfs and similar dp greedy sortings trees Statement E Codeforces Round 987 (Div. 2) {2031} PROGRAMMING 2500.0 Codeforces Round 987 (Div. 2) Editorial
1745 Tree Orientation (Hard Version) data structures dfs and similar dsu graphs greedy matrices sortings trees Statement D2 Codeforces Round 1086 (Div. 2) {2208} PROGRAMMING 1250.0 Tutorial