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6458 Vessels data structures dsu implementation trees Statement D Codeforces Round 218 (Div. 2) {371} PROGRAMMING Codeforces Round #218 (Div. 2): Tutorial 1900
2406 Merging Towers data structures dsu implementation trees Statement E Educational Codeforces Round 91 (Rated for Div. 2) {1380} PROGRAMMING Educational Codeforces Round 91 Editorial
504 Air Reform data structures dfs and similar divide and conquer dsu graphs implementation trees Statement E Codeforces Round 775 (Div. 1, based on Moscow Open Olympiad in Informatics) {1648} PROGRAMMING 2500.0 Codeforces Round #775 Editorial
3896 Monsters brute force data structures dfs and similar dsu graphs implementation trees Statement E CodeTON Round 4 (Div. 1 + Div. 2, Rated, Prizes!) {1810} PROGRAMMING 2000.0 Editorial of CodeTON Round 4 (Div. 1 + Div. 2, Rated, Prizes!)
4018 Vlad and the Mountains data structures dsu graphs implementation sortings trees two pointers Statement G Codeforces Round 888 (Div. 3) {1851} PROGRAMMING 118667
1918 Digital Village (Easy Version) brute force data structures dp dsu graphs greedy implementation math shortest paths trees Statement E1 Codeforces Round 977 (Div. 2, based on COMPFEST 16 - Final Round) {2021} PROGRAMMING 1750.0 Codeforces Round #977 (Div. 2, based on COMPFEST 16 — Final Round) Editorial
7038 Rae Taylor and Trees (hard version) binary search constructive algorithms data structures dp dsu implementation trees Statement F Codeforces Round 1065 (Div. 3) {2171} PROGRAMMING Codeforces Round 1065 (Div. 3) Editorial
11420 Rae Taylor and Trees (easy version) binary search data structures dp dsu greedy implementation trees Statement D Codeforces Round 1065 (Div. 3) {2171} PROGRAMMING Codeforces Round 1065 (Div. 3) Editorial