Problemset - Codeforces

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Codeforces Round (Div. 3)
4 days

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Difficulty: —

number theory

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Problems

#	Name
1419E	Decryption constructive algorithms, implementation, math, number theory	2100	x3163
1418F	Equal Product data structures, math, number theory, two pointers	3000	x358
1411B	Fair Numbers brute force, number theory	1000	x18367
1409C	Yet Another Array Restoration brute force, math, number theory	1200	x22957
1407B	Big Vova brute force, greedy, math, number theory	1300	x16773
1406E	Deleting Numbers interactive, math, number theory	2600	x1581
1404D	Game of Pairs constructive algorithms, dfs and similar, interactive, math, number theory	2800	x998
1401D	Maximum Distributed Tree dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees	1800	x8981
1401C	Mere Array constructive algorithms, math, number theory, sortings	1300	x23749
1398G	Running Competition bitmasks, fft, math, number theory	2600	x855
1397B	Power Sequence brute force, math, number theory, sortings	1500	x14481
1396A	Multiples of Length constructive algorithms, greedy, number theory	1600	x15142
1389E	Calendar Ambiguity math, number theory	2200	x3199
1389A	LCM Problem constructive algorithms, greedy, math, number theory	800	x39616
1388A	Captain Flint and Crew Recruitment brute force, greedy, math, number theory	800	x24665
1379B	Dubious Cyrpto binary search, brute force, math, number theory	1500	x12548
1375I	Cubic Lattice geometry, math, matrices, number theory	3500	x127
1372B	Omkar and Last Class of Math greedy, math, number theory	1300	x26828
1371E2	Asterism (Hard Version) binary search, combinatorics, dp, math, number theory, sortings	2300	x2313
1371E1	Asterism (Easy Version) binary search, brute force, combinatorics, math, number theory, sortings	1900	x5041
1370C	Number Game games, math, number theory	1400	x23913
1370B	GCD Compression constructive algorithms, math, number theory	1100	x23305
1370A	Maximum GCD greedy, implementation, math, number theory	800	x50225
1367E	Necklace Assembly brute force, dfs and similar, dp, graphs, greedy, number theory	1900	x5239
1366D	Two Divisors constructive algorithms, math, number theory	2000	x10122
1364A	XXXXX brute force, data structures, number theory, two pointers	1200	x27287
1360D	Buying Shovels math, number theory	1300	x31720
1359E	Modular Stability combinatorics, math, number theory	2000	x5859
1355F	Guess Divisors Count constructive algorithms, interactive, number theory	2600	x824
1350B	Orac and Models dp, math, number theory	1400	x21304
1349A	Orac and LCM data structures, math, number theory	1600	x16528
1346G	Two IP Cameras *special problem, math, number theory	2300	x133
1344A	Hilbert's Hotel math, number theory, sortings	1600	x15513
1342C	Yet Another Counting Problem math, number theory	1600	x13897
1334E	Divisor Paths combinatorics, graphs, greedy, math, number theory	2200	x2791
1333F	Kate and imperfection greedy, implementation, math, number theory, sortings, two pointers	2200	x4197
1332B	Composite Coloring brute force, constructive algorithms, greedy, math, number theory	1400	x17412
1331B	Limericks *special problem, math, number theory		x6988
1327D	Infinite Path brute force, dfs and similar, graphs, math, number theory	2200	x3242
1326A	Bad Ugly Numbers constructive algorithms, number theory	1000	x29899
1325E	Ehab's REAL Number Theory Problem brute force, dfs and similar, graphs, number theory, shortest paths	2600	x2004
1325D	Ehab the Xorcist bitmasks, constructive algorithms, greedy, number theory	1700	x11859
1325A	EhAb AnD gCd constructive algorithms, greedy, number theory	800	x39036
1324A	Yet Another Tetris Problem implementation, number theory	900	x25703
1322C	Instant Noodles graphs, hashing, math, number theory	2300	x2364
1312C	Adding Powers bitmasks, greedy, implementation, math, number theory, ternary search	1400	x16212
1312A	Two Regular Polygons geometry, greedy, math, number theory	800	x25646
1310F	Bad Cryptography math, number theory	3400	x72
1305F	Kuroni and the Punishment math, number theory, probabilities	2500	x2543
1305C	Kuroni and Impossible Calculation brute force, combinatorics, math, number theory	1600	x14138
1295D	Same GCDs math, number theory	1800	x8673
1294C	Product of Three Numbers greedy, math, number theory	1300	x33427
1292D	Chaotic V. dp, graphs, greedy, math, number theory, trees	2700	x785
1285F	Classical? binary search, combinatorics, number theory	2900	x1094
1285C	Fadi and LCM brute force, math, number theory	1400	x22740
1278F	Cards combinatorics, dp, math, number theory, probabilities	2600	x1783
1277B	Make Them Odd greedy, number theory	1200	x14947
1266C	Diverse Matrix constructive algorithms, greedy, math, number theory	1400	x9555
1264F	Beautiful Fibonacci Problem constructive algorithms, number theory	3500	x886
1263C	Everyone is a Winner! binary search, math, meet-in-the-middle, number theory	1400	x13548
1260C	Infinite Fence greedy, math, number theory	1700	x8157
1257G	Divisor Set divide and conquer, fft, greedy, math, number theory	2600	x584
1254B2	Send Boxes to Alice (Hard Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	2100	x3105
1254B1	Send Boxes to Alice (Easy Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	1800	x4572
1245A	Good ol' Numbers Coloring math, number theory	1000	x14082
1244C	The Football Season brute force, math, number theory	2000	x7473
1242A	Tile Painting constructive algorithms, math, number theory	1500	x12485
1238A	Prime Subtraction math, number theory	900	x23703
1228C	Primes and Multiplication math, number theory	1700	x8913
1225G	To Make 1 bitmasks, constructive algorithms, dp, greedy, number theory	3100	x531
1225D	Power Products hashing, math, number theory	1800	x7687
1223G	Wooden Raft binary search, math, number theory	3200	x228
1220D	Alex and Julian bitmasks, math, number theory	1900	x3857
1220B	Multiplication Table math, number theory	1300	x11524
1210C	Kamil and Making a Stream math, number theory, trees	2000	x3230
1209B	Koala and Lights implementation, math, number theory	1300	x8118
1208G	Polygons greedy, math, number theory	2800	x737
1204E	Natasha, Sasha and the Prefix Sums combinatorics, dp, math, number theory	2300	x1609
1200F	Graph Traveler brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory	2300	x1056
1200C	Round Corridor math, number theory	1400	x9764
1198F	GCD Groups 2 greedy, number theory, probabilities	2900	x842
1195D2	Submarine in the Rybinsk Sea (hard edition) combinatorics, math, number theory	1800	x4572
1195D1	Submarine in the Rybinsk Sea (easy edition) combinatorics, math, number theory	1500	x7812
1194F	Crossword Expert combinatorics, dp, number theory, probabilities, two pointers	2400	x980
1190F	Tokitsukaze and Powers number theory, probabilities	3400	x92
1188B	Count Pairs math, matrices, number theory, two pointers	2300	x4400
1184A3	Heidi Learns Hashing (Hard) fft, math, number theory	3100	x139
1184A2	Heidi Learns Hashing (Medium) brute force, number theory	2100	x946
1184A1	Heidi Learns Hashing (Easy) brute force, math, number theory	1200	x5894
1182F	Maximum Sine binary search, data structures, number theory	2700	x333
1182E	Product Oriented Recurrence dp, math, matrices, number theory	2300	x2598
1178D	Prime Graph constructive algorithms, greedy, math, number theory	1500	x7306
1176D	Recover it! dfs and similar, graphs, greedy, number theory, sortings	1800	x5195
1174E	Ehab and the Expected GCD Problem combinatorics, dp, math, number theory	2500	x1380
1174C	Ehab and a Special Coloring Problem constructive algorithms, number theory	1300	x11886
1166E	The LCMs Must be Large bitmasks, brute force, constructive algorithms, math, number theory	2100	x2798
1166B	All the Vowels Please constructive algorithms, math, number theory	1100	x11381
1165D	Almost All Divisors math, number theory	1600	x15583
1155C	Alarm Clocks Everywhere math, number theory	1300	x9126
1154G	Minimum Possible LCM brute force, greedy, math, number theory	2200	x2664