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3453 Mahmoud and a xor trip bitmasks constructive algorithms data structures dfs and similar dp math trees Statement E Codeforces Round 396 (Div. 2) {766} PROGRAMMING Codeforces round #396 editorial 2200
1893 Alice's Adventures in the Rabbit Hole constructive algorithms dfs and similar dp greedy math probabilities trees Statement E Codeforces Round 986 (Div. 2) {2028} PROGRAMMING 2000.0 Codeforces Round 986 (Div. 2) Editorial
6642 Inversion Value of a Permutation constructive algorithms dfs and similar dp math Statement D Educational Codeforces Round 183 (Rated for Div. 2) {2145} PROGRAMMING Educational Codeforces Round 183 Editorial