Problemset - Codeforces

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Ethflow Round 1 (Codeforces Round, Div. 1 + Div. 2)
3 days

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Problems

#	Name
2063C	Remove Exactly Two brute force, data structures, dp, fft, graphs, greedy, sortings, trees		x6560
2061G	Kevin and Teams 2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers		x223
2061F2	Kevin and Binary String (Hard Version) 2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers		x48
2061F1	Kevin and Binary String (Easy Version) 2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers		x1313
2061E	Kevin and And 2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers		x2165
2061D	Kevin and Numbers 2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers		x6186
2061C	Kevin and Puzzle 2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers		x5572
2048I2	Kevin and Puzzle (Hard Version) bitmasks, fft, math	3500	x17
2038F	Alternative Platforms combinatorics, data structures, fft, math, sortings	2500	x376
2025E	Card Game combinatorics, dp, fft, greedy, math	2200	x1917
2021E1	Digital Village (Easy Version) brute force, data structures, dfs and similar, dp, dsu, fft, graphs, greedy, implementation, math, trees	2300	x1569
1991H	Prime Split Game bitmasks, dp, fft, games, math, number theory	3300	x514
1988F	Heartbeat combinatorics, dp, fft, math	3000	x243
1975G	Zimpha Fan Club fft, greedy, math, strings	3000	x246
1967E1	Again Counting Arrays (Easy Version) combinatorics, dp, fft, math	3100	x221
1936E	Yet Yet Another Permutation Problem divide and conquer, fft, math	3400	x126
1909I	Short Permutation Problem combinatorics, dp, fft, math	1900	x122
1896H2	Cyclic Hamming (Hard Version) brute force, dp, fft, math, number theory	3500	x109
1896H1	Cyclic Hamming (Easy Version) brute force, divide and conquer, dp, fft, math, number theory	3400	x97
1856E2	PermuTree (hard version) bitmasks, dfs and similar, dp, fft, greedy, implementation, math, trees	2700	x1466
1845F	Swimmers in the Pool dp, fft, math, number theory	2800	x375
1821F	Timber combinatorics, dp, fft, math	2600	x780
1792F2	Graph Coloring (hard version) brute force, combinatorics, divide and conquer, dp, fft, graphs	2900	x402
1773G	Game of Questions bitmasks, combinatorics, dp, fft, math, probabilities	2800	x404
1770G	Koxia and Bracket divide and conquer, fft, math	3400	x162
1731F	Function Sum brute force, combinatorics, dp, fft, math	2500	x714
1726E	Almost Perfect combinatorics, fft, math	2400	x1459
1709F	Multiset of Strings bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees	2500	x578
1704H2	Game of AI (hard version) combinatorics, fft, math	3500	x93
1704H1	Game of AI (easy version) combinatorics, constructive algorithms, dp, fft, math	3200	x189
1704G	Mio and Lucky Array constructive algorithms, fft, math, strings	3500	x115
1687F	Koishi's Unconscious Permutation fft, math	3500	x88
1671F	Permutation Counting brute force, combinatorics, dp, fft, math	2700	x341
1667E	Centroid Probabilities combinatorics, dp, fft, math	3000	x692
1654H	Three Minimums combinatorics, constructive algorithms, divide and conquer, dp, fft, math	3500	x82
1644F	Basis combinatorics, fft, math, number theory	2900	x333
1641E	Special Positions combinatorics, divide and conquer, fft, math	3300	x210
1613F	Tree Coloring combinatorics, divide and conquer, fft	2600	x708
1608D	Dominoes combinatorics, fft, graphs, math, number theory	2400	x1425
1580F	Problems for Codeforces combinatorics, fft, math	3300	x137
1575C	Cyclic Sum data structures, fft, number theory	3000	x167
1574F	Occurrences combinatorics, dfs and similar, dp, dsu, fft, graphs	2700	x640
1559E	Mocha and Stars combinatorics, dp, fft, math, number theory	2200	x2364
1553I	Stairs combinatorics, divide and conquer, dp, fft, math	3400	x209
1548C	The Three Little Pigs combinatorics, dp, fft, math	2500	x1860
1542E2	Abnormal Permutation Pairs (hard version) combinatorics, dp, fft, math	2700	x880
1542E1	Abnormal Permutation Pairs (easy version) combinatorics, dp, fft, math	2400	x1275
1536F	Omkar and Akmar chinese remainder theorem, combinatorics, constructive algorithms, fft, games, geometry, math, meet-in-the-middle, string suffix structures	2600	x980
1528F	AmShZ Farm combinatorics, fft, math	3300	x292
1488J	Flower Shop *special problem, data structures, fft, math	3100	x37
1487G	String Counting combinatorics, dp, fft, math	2700	x606
1479E	School Clubs dp, fft, math, number theory, probabilities	3500	x222
1477F	Nezzar and Chocolate Bars combinatorics, fft, math, probabilities	3500	x141
1473G	Tiles combinatorics, dp, fft, math	2800	x410
1450H1	Multithreading (Easy Version) combinatorics, fft, math	2900	x451
1439D	INOI Final Contests combinatorics, dp, fft	3100	x393
1438C	Engineer Artem 2-sat, chinese remainder theorem, constructive algorithms, fft, flows	2000	x10725
1408G	Clusterization Counting combinatorics, dp, dsu, fft, graphs, trees	2700	x1080
1398G	Running Competition bitmasks, fft, math, number theory	2600	x1133
1392I	Kevin and Grid fft, graphs, math	3300	x206
1349F2	Slime and Sequences (Hard Version) dp, fft, math	3500	x115
1349F1	Slime and Sequences (Easy Version) dp, fft, math	3100	x456
1342E	Placing Rooks combinatorics, fft, math	2300	x3154
1334G	Substring Search bitmasks, brute force, fft	2900	x377
1286F	Harry The Potter brute force, constructive algorithms, dp, fft, implementation, math	3100	x250
1270I	Xor on Figures constructive algorithms, fft, math	3500	x244
1257G	Divisor Set divide and conquer, fft, greedy, math, number theory	2600	x632
1251F	Red-White Fence combinatorics, fft	2500	x840
1218E	Product Tuples divide and conquer, fft	2500	x387
1218D	Xor Spanning Tree divide and conquer, fft, graphs	2400	x524
1184A3	Heidi Learns Hashing (Hard) fft, math, number theory	3100	x141
1119H	Triple fft, math	3200	x590
1119E	Pavel and Triangles brute force, dp, fft, greedy, ternary search	1900	x5123
1103E	Radix sum fft, math, number theory	3400	x239
1096G	Lucky Tickets divide and conquer, dp, fft	2400	x1536
1054H	Epic Convolution chinese remainder theorem, fft, math, number theory	3500	x182
1036E	Covered Points fft, geometry, number theory	2400	x1665
1033F	Boolean Computer bitmasks, brute force, fft, math	2800	x394
1010F	Tree fft, graphs, trees	3400	x225
993E	Nikita and Order Statistics chinese remainder theorem, fft, math	2300	x1459
986D	Perfect Encoding fft, math	3100	x333
981H	K Paths combinatorics, data structures, dp, fft, math	3100	x272
960G	Bandit Blues combinatorics, dp, fft, math	2900	x1089
958F3	Lightsabers (hard) fft	2600	x724
954I	Yet Another String Matching Problem fft, math	2200	x1072
923E	Perpetual Subtraction fft, math, matrices	3100	x463
914G	Sum the Fibonacci bitmasks, divide and conquer, dp, fft, math	2600	x953
901E	Cyclic Cipher fft, math	3300	x88
850E	Random Elections bitmasks, brute force, divide and conquer, fft, math	2800	x409
848E	Days of Floral Colours combinatorics, divide and conquer, dp, fft, math	3400	x219
827E	Rusty String fft, math, strings	2700	x973
773F	Test Data Generation combinatorics, divide and conquer, dp, fft, math, number theory	3400	x197
755G	PolandBall and Many Other Balls combinatorics, divide and conquer, dp, fft, math, number theory	3200	x932
754E	Dasha and cyclic table bitmasks, brute force, fft, strings, trees	2600	x505
715E	Complete the Permutations combinatorics, fft, graphs, math	3400	x363
662C	Binary Table bitmasks, brute force, divide and conquer, dp, fft, math	2600	x2078
632E	Thief in a Shop divide and conquer, dp, fft, math	2400	x2887
623E	Transforming Sequence combinatorics, dp, fft, math	3300	x560
553E	Kyoya and Train dp, fft, graphs, math, probabilities	3200	x564
528D	Fuzzy Search bitmasks, brute force, fft	2500	x2273

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