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3340 Maple and Tree Beauty (Hard Version) bitmasks brute force dfs and similar divide and conquer dp fft trees Statement C2 Codeforces Round 1048 (Div. 1) {2138} PROGRAMMING 750.0 Codeforces Round 1048 (Div. 1, Div. 2) Editorial
166 Again Trees... (hard version) bitmasks data structures dfs and similar dp fft trees Statement F2 Codeforces Round 1078 (Div. 2) {2194} PROGRAMMING 1750.0 Codeforces Round #1078 Editorial
871 Again Trees... (Easy Version) bitmasks dfs and similar dp fft trees Statement F1 Codeforces Round 1078 (Div. 2) {2194} PROGRAMMING 1750.0 Codeforces Round #1078 Editorial