Problemset - Codeforces

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Educational Codeforces Round 81 (Rated for Div. 2)
7 days

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Difficulty: —

bitmasks

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Problems

#	Name
579A	Raising Bacteria bitmasks	1000	x17730
467B	Fedor and New Game bitmasks, brute force, constructive algorithms, implementation	1200	x15802
476B	Dreamoon and WiFi bitmasks, brute force, combinatorics, dp, math, probabilities	1300	x12145
535B	Tavas and SaDDas bitmasks, brute force, combinatorics, implementation	1100	x10435
1097B	Petr and a Combination Lock bitmasks, brute force, dp	1200	x9549
743B	Chloe and the sequence binary search, bitmasks, constructive algorithms, implementation	1200	x7942
550B	Preparing Olympiad bitmasks, brute force	1500	x7799
1270C	Make Good bitmasks, constructive algorithms, math	1500	x6821
1095C	Powers Of Two bitmasks, greedy	1400	x6567
1042B	Vitamins bitmasks, brute force, dp, implementation	1200	x6260
611B	New Year and Old Property bitmasks, brute force, implementation	1300	x6015
912B	New Year's Eve bitmasks, constructive algorithms, number theory	1400	x6011
484A	Bits bitmasks, constructive algorithms	1700	x5832
96B	Lucky Numbers (easy) binary search, bitmasks, brute force	1400	x5756
1152B	Neko Performs Cat Furrier Transform bitmasks, constructive algorithms, dfs and similar, math	1300	x5606
276D	Little Girl and Maximum XOR bitmasks, dp, greedy, implementation, math	1800	x5572
202A	LLPS binary search, bitmasks, brute force, greedy, implementation, strings	900	x5481
1202A	You Are Given Two Binary Strings... bitmasks, greedy	1100	x5348
913C	Party Lemonade bitmasks, dp, greedy	1600	x5061
1151B	Dima and a Bad XOR bitmasks, brute force, constructive algorithms, dp	1600	x4935
1225C	p-binary bitmasks, brute force, math	1600	x4792
580D	Kefa and Dishes bitmasks, dp	1900	x4643
437B	The Child and Set bitmasks, greedy, implementation, sortings	1500	x4419
677C	Vanya and Label bitmasks, combinatorics, implementation, strings	1500	x4369
1217C	The Number Of Good Substrings binary search, bitmasks, brute force	1600	x4333
706D	Vasiliy's Multiset binary search, bitmasks, data structures, trees	1800	x4212
224B	Array bitmasks, implementation, two pointers	1500	x3784
961C	Chessboard bitmasks, brute force, implementation	1400	x3767
878A	Short Program bitmasks, constructive algorithms	1600	x3760
1051D	Bicolorings bitmasks, dp	1700	x3738
1205B	Shortest Cycle bitmasks, brute force, graphs, shortest paths	1900	x3701
812B	Sagheer, the Hausmeister bitmasks, brute force, dp	1600	x3451
1207E	XOR Guessing bitmasks, interactive, math	1800	x3120
242E	XOR on Segment bitmasks, data structures	2000	x3082
1285D	Dr. Evil Underscores bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees	1800	x2998
510D	Fox And Jumping bitmasks, brute force, dp, math	2100	x2956
1174D	Ehab and the Expected XOR Problem bitmasks, constructive algorithms	1900	x2832
868C	Qualification Rounds bitmasks, brute force, constructive algorithms, dp	1500	x2757
960C	Subsequence Counting bitmasks, constructive algorithms, greedy, implementation	1700	x2636
570D	Tree Requests binary search, bitmasks, constructive algorithms, dfs and similar, graphs, trees	2400	x2616
244B	Undoubtedly Lucky Numbers bitmasks, brute force, dfs and similar	1600	x2602
453B	Little Pony and Harmony Chest bitmasks, brute force, dp	2200	x2539
581D	Three Logos bitmasks, brute force, constructive algorithms, geometry, implementation, math	1700	x2477
1144E	Median String bitmasks, math, number theory, strings	1900	x2469
243A	The Brand New Function bitmasks	1900	x2437
1288D	Minimax Problem binary search, bitmasks, dp	2000	x2360
888E	Maximum Subsequence bitmasks, divide and conquer, meet-in-the-middle	1800	x2342
1017D	The Wu bitmasks, brute force, data structures	1900	x2335
1220D	Alex and Julian bitmasks, math, number theory	1900	x2308
27B	Tournament bitmasks, brute force, dfs and similar, greedy	2000	x2282
513B2	Permutations bitmasks, divide and conquer, math	1800	x2233
165E	Compatible Numbers bitmasks, brute force, dfs and similar, dp	2100	x2193
401D	Roman and Numbers bitmasks, brute force, combinatorics, dp, number theory	2000	x2157
877E	Danil and a Part-time Job bitmasks, data structures, trees	2000	x2150
1146C	Tree Diameter bitmasks, graphs, interactive	1700	x2144
959E	Mahmoud and Ehab and the xor-MST bitmasks, dp, graphs, implementation, math	1900	x2127
981D	Bookshelves bitmasks, dp, greedy	1800	x1979
114B	PFAST Inc. bitmasks, brute force, graphs	1500	x1960
620E	New Year Tree bitmasks, data structures, trees	2100	x1933
1030E	Vasya and Good Sequences bitmasks, dp	2100	x1837
792D	Paths in a Complete Binary Tree bitmasks, trees	1800	x1836
895C	Square Subsets bitmasks, combinatorics, dp, math	2000	x1821
11D	A Simple Task bitmasks, dp, graphs	2200	x1803
282E	Sausage Maximization bitmasks, data structures, trees	2100	x1769
707D	Persistent Bookcase bitmasks, data structures, dfs and similar, implementation	2100	x1740
1006F	Xor-Paths bitmasks, brute force, dp, meet-in-the-middle	2400	x1737
778B	Bitwise Formula bitmasks, brute force, dfs and similar, expression parsing, implementation	2000	x1703
1166E	The LCMs Must be Large bitmasks, brute force, constructive algorithms, math, number theory	2000	x1700
388B	Fox and Minimal path bitmasks, constructive algorithms, graphs, implementation, math	2000	x1697
442A	Borya and Hanabi bitmasks, brute force, implementation	2000	x1682
768E	Game of Stones bitmasks, dp, games	2000	x1659
1088D	Ehab and another another xor problem bitmasks, constructive algorithms, implementation, interactive	2000	x1645
8C	Looking for Order bitmasks, dp	2000	x1578
449D	Jzzhu and Numbers bitmasks, combinatorics, dp	2400	x1568
1209E1	Rotate Columns (easy version) bitmasks, brute force, dp, greedy, sortings	2000	x1562
769D	k-Interesting Pairs Of Integers *special problem, bitmasks, brute force, meet-in-the-middle	1800	x1557
547C	Mike and Foam bitmasks, combinatorics, dp, math, number theory	2700	x1543
291C	Network Mask *special problem, bitmasks, brute force, implementation	2100	x1543
16E	Fish bitmasks, dp, probabilities	2100	x1536
993B	Open Communication bitmasks, brute force	1900	x1510
1215E	Marbles bitmasks, dp	2200	x1443
451E	Devu and Flowers bitmasks, combinatorics, number theory	2400	x1437
525E	Anya and Cubes binary search, bitmasks, brute force, dp, math, meet-in-the-middle	2200	x1432
1185G1	Playlist for Polycarp (easy version) bitmasks, combinatorics, dp	2100	x1423
900D	Unusual Sequences bitmasks, combinatorics, dp, math, number theory	2100	x1422
766E	Mahmoud and a xor trip bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees	2200	x1420
431D	Random Task binary search, bitmasks, combinatorics, dp, math	2200	x1382
417D	Cunning Gena bitmasks, dp, greedy, sortings	2000	x1373
1238E	Keyboard Purchase bitmasks, dp	2200	x1334
744B	Hongcow's Game bitmasks, divide and conquer, interactive	2000	x1311
333D	Characteristics of Rectangles binary search, bitmasks, brute force, implementation, sortings	2100	x1265
1168C	And Reachability bitmasks, dp	2400	x1259
513C	Second price auction bitmasks, probabilities	2000	x1251
875D	High Cry binary search, bitmasks, combinatorics, data structures, divide and conquer	2200	x1223
916B	Jamie and Binary Sequence (changed after round) bitmasks, greedy, math	1700	x1197
1234F	Yet Another Substring Reverse bitmasks, dp	2400	x1196
986C	AND Graph bitmasks, dfs and similar, dsu, graphs	2300	x1192
379D	New Year Letter bitmasks, brute force, dp	2000	x1186
285D	Permutation Sum bitmasks, combinatorics, dp, implementation, meet-in-the-middle	1900	x1185
528D	Fuzzy Search bitmasks, brute force, fft	2500	x1124

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