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2289 Nastia Plays with a Tree constructive algorithms data structures dfs and similar dp flows graphs greedy implementation trees Statement D Codeforces Round 720 (Div. 2) {1521} PROGRAMMING 2250.0 90477
2480 Tree Coloring (Hard Version) constructive algorithms data structures dfs and similar greedy implementation trees Statement D2 Hello 2026 {2183} PROGRAMMING 2000.0