Problemset - Codeforces

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Educational Codeforces Round 97 (Rated for Div. 2)
45:10:18
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number theory

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Problems

#	Name
1436F	Sum Over Subsets combinatorics, math, number theory	2800	x72
1427E	Xum bitmasks, constructive algorithms, math, matrices, number theory	2500	x642
1423K	Lonely Numbers binary search, math, number theory, two pointers	1600	x1738
1422F	Boring Queries data structures, math, number theory	2700	x276
1419E	Decryption constructive algorithms, implementation, math, number theory	2100	x2248
1418F	Equal Product data structures, math, number theory, two pointers	3000	x162
1406E	Deleting Numbers interactive, math, number theory	2600	x914
1407B	Big Vova brute force, greedy, math, number theory	1300	x10937
1404D	Game of Pairs constructive algorithms, dfs and similar, interactive, math, number theory	2800	x461
1409C	Yet Another Array Restoration brute force, math, number theory	1200	x14468
1397B	Power Sequence brute force, math, number theory, sortings	1500	x9644
1396A	Multiples of Length constructive algorithms, greedy, number theory	1600	x9274
1401D	Maximum Distributed Tree dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees	1800	x5724
1401C	Mere Array constructive algorithms, math, number theory, sortings	1300	x14100
1398G	Running Competition bitmasks, fft, math, number theory	2600	x379
1388A	Captain Flint and Crew Recruitment brute force, greedy, math, number theory	800	x19226
1389E	Calendar Ambiguity math, number theory	2200	x2230
1389A	LCM Problem constructive algorithms, greedy, math, number theory	800	x21046
1379B	Dubious Cyrpto binary search, brute force, math, number theory	1500	x8298
1372B	Omkar and Last Class of Math greedy, math, number theory	1300	x15665
1375I	Cubic Lattice geometry, math, matrices, number theory	3500	x39
1371E2	Asterism (Hard Version) binary search, combinatorics, dp, math, number theory, sortings	2300	x1737
1371E1	Asterism (Easy Version) binary search, brute force, combinatorics, math, number theory, sortings	1900	x3788
1370C	Number Game games, math, number theory	1400	x13855
1370B	GCD Compression constructive algorithms, math, number theory	1100	x16397
1370A	Maximum GCD greedy, implementation, math, number theory	800	x23527
1367E	Necklace Assembly brute force, dfs and similar, dp, graphs, greedy, number theory	1900	x3677
1364A	XXXXX brute force, data structures, number theory, two pointers	1200	x15356
1366D	Two Divisors constructive algorithms, math, number theory	2000	x6029
1346G	Two IP Cameras *special problem, math, number theory	2300	x83
1359E	Modular Stability combinatorics, math, number theory	2000	x3951
1360D	Buying Shovels math, number theory	1300	x16611
1355F	Guess Divisors Count constructive algorithms, interactive, number theory	2600	x482
1350B	Orac and Models dp, math, number theory	1400	x12114
1349A	Orac and LCM data structures, math, number theory	1600	x9711
1342C	Yet Another Counting Problem math, number theory	1600	x9937
1344A	Hilbert's Hotel math, number theory, sortings	1600	x10931
1334E	Divisor Paths combinatorics, graphs, greedy, math, number theory	2200	x1783
1333F	Kate and imperfection greedy, implementation, math, number theory, sortings, two pointers	2200	x3024
1331B	Limericks math, number theory		x5876
1332B	Composite Coloring brute force, constructive algorithms, greedy, math, number theory	1400	x11914
1327D	Infinite Path brute force, dfs and similar, graphs, math, number theory	2200	x2360
1326A	Bad Ugly Numbers constructive algorithms, number theory	1000	x18236
1325E	Ehab's REAL Number Theory Problem brute force, dfs and similar, graphs, number theory, shortest paths	2600	x1214
1325D	Ehab the Xorcist bitmasks, constructive algorithms, greedy, number theory	1700	x7577
1325A	EhAb AnD gCd constructive algorithms, greedy, number theory	800	x21207
1324A	Yet Another Tetris Problem implementation, number theory	900	x18218
1312C	Adding Powers bitmasks, greedy, implementation, math, number theory, ternary search	1400	x10550
1312A	Two Regular Polygons geometry, greedy, math, number theory	800	x18013
1322C	Instant Noodles graphs, hashing, math, number theory	2300	x1193
1305F	Kuroni and the Punishment math, number theory, probabilities	2500	x1197
1305C	Kuroni and Impossible Calculation brute force, combinatorics, math, number theory	1600	x8369
1310F	Bad Cryptography math, number theory	3400	x30
1295D	Same GCDs math, number theory	1800	x5213
1294C	Product of Three Numbers greedy, math, number theory	1300	x15788
1292D	Chaotic V. dp, graphs, greedy, math, number theory, trees	2700	x509
1285F	Classical? binary search, combinatorics, number theory	2900	x490
1285C	Fadi and LCM brute force, math, number theory	1400	x12077
1278F	Cards combinatorics, dp, math, number theory, probabilities	2600	x615
1266C	Diverse Matrix constructive algorithms, greedy, math, number theory	1400	x6895
1277B	Make Them Odd greedy, number theory	1200	x8420
1264F	Beautiful Fibonacci Problem constructive algorithms, number theory	3500	x89
1263C	Everyone is a Winner! binary search, math, meet-in-the-middle, number theory	1400	x8680
1260C	Infinite Fence greedy, math, number theory	1700	x5822
1254B2	Send Boxes to Alice (Hard Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	2100	x2022
1254B1	Send Boxes to Alice (Easy Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	1800	x2967
1257G	Divisor Set divide and conquer, fft, greedy, math, number theory	2600	x353
1242A	Tile Painting constructive algorithms, math, number theory	1500	x8751
1245A	Good ol' Numbers Coloring math, number theory	1000	x10927
1225G	To Make 1 bitmasks, constructive algorithms, dp, greedy, number theory	3100	x170
1225D	Power Products hashing, math, number theory	1800	x4104
1244C	The Football Season brute force, math, number theory	2000	x5281
1238A	Prime Subtraction math, number theory	900	x15202
1223G	Wooden Raft binary search, math, number theory	3200	x116
1228C	Primes and Multiplication math, number theory	1700	x6359
1210C	Kamil and Making a Stream math, number theory, trees	2000	x2323
1220D	Alex and Julian bitmasks, math, number theory	1900	x2800
1220B	Multiplication Table math, number theory	1300	x8470
1209B	Koala and Lights implementation, math, number theory	1300	x6407
1208G	Polygons greedy, math, number theory	2800	x420
1204E	Natasha, Sasha and the Prefix Sums combinatorics, dp, math, number theory	2300	x941
1200F	Graph Traveler brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory	2300	x650
1200C	Round Corridor math, number theory	1400	x7448
1198F	GCD Groups 2 greedy, number theory, probabilities	2900	x336
1195D2	Submarine in the Rybinsk Sea (hard edition) combinatorics, math, number theory	1800	x3478
1195D1	Submarine in the Rybinsk Sea (easy edition) combinatorics, math, number theory	1500	x6114
1178D	Prime Graph constructive algorithms, greedy, math, number theory	1500	x5148
1194F	Crossword Expert combinatorics, dp, number theory, probabilities, two pointers	2400	x545
1190F	Tokitsukaze and Powers number theory, probabilities	3400	x51
1184A3	Heidi Learns Hashing (Hard) fft, math, number theory	3100	x51
1184A2	Heidi Learns Hashing (Medium) brute force, number theory	2100	x739
1184A1	Heidi Learns Hashing (Easy) brute force, math, number theory	1200	x3919
1188B	Count Pairs math, matrices, number theory, two pointers	2300	x2838
1182F	Maximum Sine binary search, data structures, number theory	2700	x192
1182E	Product Oriented Recurrence dp, math, matrices, number theory	2300	x1621
1176D	Recover it! dfs and similar, graphs, greedy, number theory, sortings	1800	x3346
1174E	Ehab and the Expected GCD Problem combinatorics, dp, math, number theory	2500	x810
1174C	Ehab and a Special Coloring Problem constructive algorithms, number theory	1300	x8624
1148G	Gold Experience constructive algorithms, graphs, math, number theory, probabilities	3300	x110
1166E	The LCMs Must be Large bitmasks, brute force, constructive algorithms, math, number theory	2100	x1954

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