Problemset - Codeforces

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Before contest
Codeforces Round 941 (Div. 1)
4 days

Before contest
Codeforces Round 941 (Div. 2)
4 days

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bitmasks

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Problems

#	Name
581D	Three Logos bitmasks, brute force, constructive algorithms, geometry, implementation, math	1700	x3411
1316E	Team Building bitmasks, dp, greedy, sortings	2300	x3397
1146C	Tree Diameter bitmasks, graphs, interactive	1700	x3389
1446C	Xor Tree binary search, bitmasks, data structures, divide and conquer, dp, trees	2100	x3382
282E	Sausage Maximization bitmasks, data structures, trees	2200	x3341
1017D	The Wu bitmasks, brute force, data structures	1900	x3326
1854B	Earn or Unlock bitmasks, brute force, dp	2200	x3306
959E	Mahmoud and Ehab and the xor-MST bitmasks, dp, graphs, implementation, math	1900	x3300
8C	Looking for Order bitmasks, dp	2000	x3238
1392E	Omkar and Duck bitmasks, constructive algorithms, interactive, math	2100	x3234
451E	Devu and Flowers bitmasks, combinatorics, number theory	2300	x3212
1777D	Score of a Tree bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees	1900	x3191
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x3179
981D	Bookshelves bitmasks, dp, greedy	1900	x3155
1331C	...And after happily lived ever they *special problem, bitmasks		x3131
1934D1	XOR Break --- Solo Version bitmasks, constructive algorithms, greedy	2100	x2995
803F	Coprime Subsequences bitmasks, combinatorics, number theory	2000	x2981
1030E	Vasya and Good Sequences bitmasks, dp	2000	x2967
900D	Unusual Sequences bitmasks, combinatorics, dp, math, number theory	2000	x2965
1338C	Perfect Triples bitmasks, brute force, constructive algorithms, divide and conquer, math	2200	x2956
1215E	Marbles bitmasks, dp	2200	x2909
792D	Paths in a Complete Binary Tree bitmasks, trees	1900	x2896
1605D	Treelabeling bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees	2100	x2830
1451E2	Bitwise Queries (Hard Version) bitmasks, constructive algorithms, interactive, math	2300	x2822
766E	Mahmoud and a xor trip bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees	2100	x2802
1466F	Euclid's nightmare bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings	2100	x2786
1088D	Ehab and another another xor problem bitmasks, constructive algorithms, implementation, interactive	2000	x2754
1238E	Keyboard Purchase bitmasks, dp	2200	x2724
525E	Anya and Cubes binary search, bitmasks, brute force, dp, math, meet-in-the-middle	2100	x2721
1209E1	Rotate Columns (easy version) bitmasks, brute force, dp, greedy, sortings	2000	x2712
547C	Mike and Foam bitmasks, combinatorics, dp, math, number theory	2300	x2698
817E	Choosing The Commander bitmasks, data structures, trees	2000	x2677
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x2669
1748D	ConstructOR bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory	2100	x2651
1166E	The LCMs Must be Large bitmasks, brute force, constructive algorithms, math, number theory	2100	x2643
768E	Game of Stones bitmasks, dp, games	2100	x2626
707D	Persistent Bookcase bitmasks, data structures, dfs and similar, implementation	2200	x2591
513B2	Permutations bitmasks, divide and conquer, math	1800	x2561
1185G1	Playlist for Polycarp (easy version) bitmasks, combinatorics, dp	2100	x2550
1864E	Guess Game bitmasks, data structures, games, math, probabilities, sortings, strings, trees	2100	x2458
1732C2	Sheikh (Hard Version) binary search, bitmasks, brute force, greedy, implementation, two pointers	2100	x2448
388B	Fox and Minimal path bitmasks, constructive algorithms, graphs, implementation, math	1900	x2431
1658D2	388535 (Hard Version) bitmasks, brute force, data structures, math	2300	x2430
1709E	XOR Tree bitmasks, data structures, dfs and similar, dsu, greedy, trees	2400	x2420
1957D	A BIT of an Inequality bitmasks, brute force, combinatorics, dp, math		x2386
1073E	Segment Sum bitmasks, combinatorics, dp, math	2300	x2372
417D	Cunning Gena bitmasks, dp, greedy, sortings	1900	x2370
1234F	Yet Another Substring Reverse bitmasks, dp	2200	x2354
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2331
1168C	And Reachability bitmasks, dp	2200	x2321
1868B2	Candy Party (Hard Version) bitmasks, constructive algorithms, dp, greedy, implementation, math	2100	x2257
778B	Bitwise Formula bitmasks, brute force, dfs and similar, expression parsing, implementation	1800	x2253
1476E	Pattern Matching bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings	2300	x2237
769D	k-Interesting Pairs Of Integers *special problem, bitmasks, brute force, meet-in-the-middle	1700	x2206
1870E	Another MEX Problem bitmasks, brute force, dp, shortest paths	2300	x2188
986C	AND Graph bitmasks, dfs and similar, dsu, graphs	2500	x2182
1787E	The Harmonization of XOR bitmasks, constructive algorithms, greedy, math	2100	x2167
1043F	Make It One bitmasks, combinatorics, dp, math, number theory, shortest paths	2500	x2167
431D	Random Task binary search, bitmasks, combinatorics, dp, math	2100	x2103
442A	Borya and Hanabi bitmasks, brute force, implementation	1700	x2092
1208F	Bits And Pieces bitmasks, dfs and similar, dp, greedy	2600	x2089
1523D	Love-Hate bitmasks, brute force, dp, probabilities	2400	x2074
528D	Fuzzy Search bitmasks, brute force, fft	2500	x2044
981E	Addition on Segments bitmasks, data structures, divide and conquer, dp	2200	x1990
1705E	Mark and Professor Koro binary search, bitmasks, brute force, combinatorics, data structures, greedy	2300	x1975
875D	High Cry binary search, bitmasks, combinatorics, data structures, divide and conquer	2200	x1967
1625D	Binary Spiders bitmasks, data structures, implementation, math, sortings, trees	2300	x1963
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x1952
662C	Binary Table bitmasks, brute force, divide and conquer, dp, fft, math	2600	x1937
959F	Mahmoud and Ehab and yet another xor task bitmasks, dp, math, matrices	2400	x1934
993B	Open Communication bitmasks, brute force	1900	x1928
1257F	Make Them Similar bitmasks, brute force, hashing, meet-in-the-middle	2400	x1926
1102F	Elongated Matrix binary search, bitmasks, brute force, dp, graphs	2000	x1897
678E	Another Sith Tournament bitmasks, dp, math, probabilities	2200	x1896
1469E	A Bit Similar bitmasks, brute force, hashing, string suffix structures, strings, two pointers	2400	x1848
1209E2	Rotate Columns (hard version) bitmasks, dp, greedy, sortings	2500	x1845
333D	Characteristics of Rectangles binary search, bitmasks, brute force, implementation, sortings	2100	x1843
1609E	William The Oblivious bitmasks, data structures, dp, matrices	2400	x1835
1615D	X(or)-mas Tree bitmasks, dfs and similar, dsu, graphs, trees	2200	x1833
1622E	Math Test bitmasks, brute force, greedy	2200	x1829
1093G	Multidimensional Queries bitmasks, data structures	2300	x1819
1114F	Please, another Queries on Array? bitmasks, data structures, divide and conquer, math, number theory	2400	x1807
1185F	Two Pizzas bitmasks, brute force	2100	x1798
1194E	Count The Rectangles bitmasks, brute force, data structures, geometry, sortings	2200	x1729
1720D2	Xor-Subsequence (hard version) bitmasks, data structures, dp, strings, trees	2400	x1720
1245F	Daniel and Spring Cleaning bitmasks, brute force, combinatorics, dp	2300	x1715
744B	Hongcow's Game bitmasks, divide and conquer, interactive	1900	x1706
979D	Kuro and GCD and XOR and SUM binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees	2200	x1680
920G	List Of Integers binary search, bitmasks, brute force, combinatorics, math, number theory	2200	x1670
916B	Jamie and Binary Sequence (changed after round) bitmasks, greedy, math	2000	x1668
291C	Network Mask *special problem, bitmasks, brute force, implementation	1600	x1663
1670E	Hemose on the Tree bitmasks, constructive algorithms, dfs and similar, trees	2200	x1660
855E	Salazar Slytherin's Locket bitmasks, dp	2200	x1606
1327F	AND Segments bitmasks, combinatorics, data structures, dp, two pointers	2500	x1601
1105E	Helping Hiasat bitmasks, brute force, dp, meet-in-the-middle	2200	x1586
1789D	Serval and Shift-Shift-Shift bitmasks, brute force, constructive algorithms, implementation	2200	x1558
1411E	Poman Numbers bitmasks, greedy, math, strings	2300	x1552
1592E	Bored Bakry bitmasks, greedy, math, two pointers	2400	x1541
513C	Second price auction bitmasks, probabilities	2000	x1516
285D	Permutation Sum bitmasks, combinatorics, dp, implementation, meet-in-the-middle	1900	x1506