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2859 Petya and Construction Set constructive algorithms graphs math sortings trees Statement E Codeforces Round 583 (Div. 1 + Div. 2, based on Olympiad of Metropolises) {1214} PROGRAMMING Tutorial 2000
10501 Maximum Distributed Tree constructive algorithms dfs and similar greedy math number theory sortings trees Statement D Codeforces Round 665 (Div. 2) {1401} PROGRAMMING 1750.0 Codeforces Round #665 (Div. 2) Editorial
7373 Lisa and the Martians bitmasks data structures greedy math sortings strings trees Statement F Codeforces Round 888 (Div. 3) {1851} PROGRAMMING 118667
29108 Strong Vertices math sortings trees Statement D Codeforces Round 891 (Div. 3) {1857} PROGRAMMING 119134
2258 Sasha and the Wedding Binary Search Tree combinatorics dfs and similar math sortings trees Statement F Codeforces Round 926 (Div. 2) {1929} PROGRAMMING 3000.0 Codeforces Round #926 (Div. 2) Editorial.
12482 Divine Tree constructive algorithms greedy math sortings trees Statement C Codeforces Round 1033 (Div. 2) and CodeNite 2025 {2120} PROGRAMMING 1250.0 Codeforces Round 1033 (Div. 2) and CodeNite 2025 Editorial