Problemset - Codeforces

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Educational Codeforces Round 81 (Rated for Div. 2)
04:44:57
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number theory

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Problems

#	Name
1294C	Product of Three Numbers greedy, math, number theory	1300	x9460
1292D	Chaotic V. dp, graphs, greedy, math, number theory, trees	2700	x332
1285F	Classical? binary search, combinatorics, number theory	2800	x266
1285C	Fadi and LCM brute force, math, number theory	1400	x7838
1278F	Cards combinatorics, dp, math, number theory, probabilities	2600	x399
1266C	Diverse Matrix constructive algorithms, greedy, math, number theory	1400	x5166
1277B	Make Them Odd greedy, number theory	1200	x6013
1264F	Beautiful Fibonacci Problem constructive algorithms, number theory	3600	x52
1263C	Everyone is a Winner! binary search, math, meet-in-the-middle, number theory	1400	x6155
1260C	Infinite Fence greedy, math, number theory	1700	x4099
1254B2	Send Boxes to Alice (Hard Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	2100	x1548
1254B1	Send Boxes to Alice (Easy Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	2000	x2290
1257G	Divisor Set divide and conquer, fft, greedy, math, number theory	2700	x273
1242A	Tile Painting constructive algorithms, math, number theory	1500	x6837
1245A	Good ol' Numbers Coloring math, number theory	1000	x8925
1225G	To Make 1 bitmasks, constructive algorithms, dp, greedy, number theory	3000	x132
1225D	Power Products hashing, math, number theory	1900	x3219
1244C	The Football Season brute force, math, number theory	1900	x4229
1238A	Prime Subtraction math, number theory	900	x11757
1223G	Wooden Raft binary search, math, number theory	3100	x109
1228C	Primes and Multiplication math, number theory	1600	x5225
1210C	Kamil and Making a Stream math, number theory, trees	2100	x1975
1220D	Alex and Julian bitmasks, math, number theory	1900	x2318
1220B	Multiplication Table math, number theory	1300	x6827
1209B	Koala and Lights implementation, math, number theory	1300	x5667
1208G	Polygons greedy, math, number theory	2700	x374
1204E	Natasha, Sasha and the Prefix Sums combinatorics, dp, math, number theory	2400	x798
1200F	Graph Traveler brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory	2500	x557
1200C	Round Corridor math, number theory	1500	x6258
1198F	GCD Groups 2 greedy, number theory, probabilities	2900	x277
1195D2	Submarine in the Rybinsk Sea (hard edition) combinatorics, math, number theory	1700	x3019
1195D1	Submarine in the Rybinsk Sea (easy edition) combinatorics, math, number theory	1500	x5271
1178D	Prime Graph constructive algorithms, greedy, math, number theory	1600	x4211
1194F	Crossword Expert combinatorics, dp, number theory, probabilities, two pointers	2500	x444
1190F	Tokitsukaze and Powers number theory, probabilities	3300	x36
1184A3	Heidi Learns Hashing (Hard) fft, math, number theory	3100	x41
1184A2	Heidi Learns Hashing (Medium) brute force, number theory	2100	x699
1184A1	Heidi Learns Hashing (Easy) brute force, math, number theory	1200	x3044
1188B	Count Pairs math, matrices, number theory, two pointers	2200	x2406
1182F	Maximum Sine binary search, data structures, number theory	2900	x161
1182E	Product Oriented Recurrence dp, math, matrices, number theory	2200	x1375
1176D	Recover it! dfs and similar, graphs, greedy, number theory, sortings	1900	x2652
1174E	Ehab and the Expected GCD Problem combinatorics, dp, math, number theory	2500	x655
1174C	Ehab and a Special Coloring Problem constructive algorithms, number theory	1300	x6962
1148G	Gold Experience constructive algorithms, graphs, math, number theory, probabilities	3100	x82
1166E	The LCMs Must be Large bitmasks, brute force, constructive algorithms, math, number theory	2000	x1705
1166B	All the Vowels Please constructive algorithms, math, number theory	1100	x7460
1165D	Almost All Divisors math, number theory	1600	x5706
1149A	Prefix Sum Primes constructive algorithms, greedy, math, number theory	1300	x7740
1152C	Neko does Maths brute force, math, number theory	1800	x3580
1155C	Alarm Clocks Everywhere math, number theory	1300	x5872
1146D	Frog Jumping dfs and similar, math, number theory	2100	x782
1154G	Minimum Possible LCM brute force, greedy, math, number theory	2400	x1359
1144E	Median String bitmasks, math, number theory, strings	1900	x2478
1143B	Nirvana brute force, math, number theory	1300	x6040
1139D	Steps to One dp, math, number theory, probabilities	2300	x832
1137D	Cooperative Game constructive algorithms, interactive, number theory	2500	x609
1133D	Zero Quantity Maximization hashing, math, number theory	1500	x4991
1133B	Preparation for International Women's Day math, number theory	1300	x6834
1113B	Sasha and Magnetic Machines greedy, number theory	1300	x5302
1109E	Sasha and a Very Easy Test data structures, number theory	2700	x238
1114F	Please, another Queries on Array? bitmasks, data structures, divide and conquer, math, number theory	2500	x871
1114E	Arithmetic Progression binary search, interactive, number theory, probabilities	2100	x1734
1114C	Trailing Loves (or L'oeufs?) brute force, implementation, math, number theory	1700	x4894
1110C	Meaningless Operations constructive algorithms, math, number theory	1500	x5451
1106F	Lunar New Year and a Recursive Sequence math, matrices, number theory	2400	x500
1107D	Compression dp, implementation, math, number theory	1800	x2549
1107B	Digital root math, number theory	1100	x7871
1108B	Divisors of Two Integers brute force, greedy, math, number theory	1100	x11167
1103E	Radix sum fft, math, number theory	3300	x78
1101D	GCD Counting data structures, dfs and similar, dp, number theory, trees	2000	x2070
1098E	Fedya the Potter binary search, implementation, math, number theory	3400	x70
1097F	Alex and a TV Show bitmasks, combinatorics, number theory	2400	x687
1097D	Makoto and a Blackboard dp, math, number theory, probabilities	2200	x1691
1091G	New Year and the Factorisation Collaboration interactive, math, number theory	3100	x99
1091C	New Year and the Sphere Transmission math, number theory	1400	x6580
1081E	Missing Numbers binary search, constructive algorithms, greedy, math, number theory	1900	x1575
1056B	Divide Candies math, number theory	1600	x2700
1061C	Multiplicity data structures, dp, implementation, math, number theory	1700	x3358
1062B	Math greedy, math, number theory	1600	x4473
1076B	Divisor Subtraction implementation, math, number theory	1200	x6946
1055C	Lucky Days math, number theory	1900	x1330
1043F	Make It One bitmasks, combinatorics, dp, math, number theory, shortest paths	2500	x927
1068B	LCM math, number theory	1200	x5641
1070A	Find a Number dp, graphs, number theory, shortest paths	2200	x1393
1054H	Epic Convolution chinese remainder theorem, fft, math, number theory	3400	x57
1033D	Divisors interactive, math, number theory	2000	x1445
1033B	Square Difference math, number theory	1100	x4946
1030G	Linear Congruential Generator number theory	3000	x203
1030D	Vasya and Triangle geometry, number theory	1700	x4048
1045B	Space Isaac hashing, number theory	2500	x312
1034C	Region Separation combinatorics, dp, number theory, trees	2900	x335
1034A	Enlarge GCD number theory	1700	x4293
1051B	Relatively Prime Pairs greedy, math, number theory	1000	x8060
1036F	Relatively Prime Powers combinatorics, math, number theory	2400	x737
1036E	Covered Points fft, geometry, number theory	2300	x913
1029F	Multicolored Markers binary search, brute force, math, number theory	2100	x1473
1025D	Recovering BST brute force, dp, math, number theory, trees	2000	x2044
1025B	Weakened Common Divisor brute force, greedy, number theory	1600	x4764
1027G	X-mouse in the Campus bitmasks, math, number theory	2800	x158

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