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391 Tree Calendar brute force constructive algorithms dfs and similar sortings Statement E Codeforces Round 715 (Div. 1) {1508} PROGRAMMING 2250.0 Codeforces Round #715 Editorial
1194 Doremy's Experimental Tree brute force constructive algorithms dfs and similar dsu sortings trees Statement F Codeforces Global Round 24 {1764} PROGRAMMING 2250.0 Codeforces Global Round 24 Editorial