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10878 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
481 Modular Tree dfs and similar greedy math number theory trees Statement G Codeforces Round 1122 (Div. 3) {2266} PROGRAMMING