Problemset - Codeforces

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Educational Codeforces Round 131 (Rated for Div. 2)
30:23:12
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number theory

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Problems

#	Name
1375I	Cubic Lattice geometry, math, matrices, number theory	3500	x61
1687E	Become Big For Me combinatorics, constructive algorithms, greedy, math, number theory	3500	x94
1479E	School Clubs dp, fft, math, number theory, probabilities	3500	x94
1054H	Epic Convolution chinese remainder theorem, fft, math, number theory	3500	x133
1264F	Beautiful Fibonacci Problem constructive algorithms, number theory	3500	x266
1310F	Bad Cryptography math, number theory	3400	x47
756F	Long number expression parsing, math, number theory	3400	x71
1190F	Tokitsukaze and Powers number theory, probabilities	3400	x72
804F	Fake bullions combinatorics, dfs and similar, dp, graphs, number theory	3400	x108
1098E	Fedya the Potter binary search, implementation, math, number theory	3400	x129
773F	Test Data Generation combinatorics, divide and conquer, dp, fft, math, number theory	3400	x139
1103E	Radix sum fft, math, number theory	3400	x174
1630F	Making It Bipartite flows, graph matchings, graphs, number theory	3400	x198
1148G	Gold Experience constructive algorithms, graphs, math, number theory, probabilities	3300	x183
1548D2	Gregor and the Odd Cows (Hard) brute force, geometry, math, number theory	3300	x197
1552H	Guess the Perimeter binary search, interactive, number theory	3300	x199
986F	Oppa Funcan Style Remastered graphs, math, number theory, shortest paths	3300	x280
582D	Number of Binominal Coefficients dp, math, number theory	3300	x398
765G	Math, math everywhere brute force, dp, math, meet-in-the-middle, number theory	3200	x42
1566H	Xor-quiz constructive algorithms, dp, interactive, math, number theory	3200	x74
500G	New Year Running number theory, trees	3200	x92
1091G	New Year and the Factorisation Collaboration interactive, math, number theory	3200	x144
913G	Power Substring math, number theory	3200	x161
1223G	Wooden Raft binary search, math, number theory	3200	x164
1656H	Equal LCM Subsets data structures, math, number theory	3200	x198
755G	PolandBall and Many Other Balls combinatorics, divide and conquer, dp, fft, math, number theory	3200	x557
1184A3	Heidi Learns Hashing (Hard) fft, math, number theory	3100	x94
1225G	To Make 1 bitmasks, constructive algorithms, dp, greedy, number theory	3100	x269
516E	Drazil and His Happy Friends math, number theory	3100	x330
653G	Move by Prime combinatorics, math, number theory	3100	x359
809E	Surprise me! divide and conquer, math, number theory, trees	3100	x523
438E	The Child and Binary Tree combinatorics, divide and conquer, fft, number theory	3100	x1358
1575C	Cyclic Sum data structures, fft, number theory	3000	x106
346E	Doodle Jump math, number theory	3000	x190
698F	Coprime Permutation combinatorics, number theory	3000	x254
1418F	Equal Product data structures, math, number theory, two pointers	3000	x258
1603D	Artistic Partition divide and conquer, dp, number theory	3000	x344
1698G	Long Binary String bitmasks, math, matrices, meet-in-the-middle, number theory	2900	x100
819D	Mister B and Astronomers number theory	2900	x158
819C	Mister B and Beacons on Field number theory	2900	x183
717A	Festival Organization math, number theory	2900	x220
449E	Jzzhu and Squares dp, math, number theory	2900	x229
1644F	Basis combinatorics, fft, math, number theory	2900	x231
1562F	Tubular Bells interactive, math, number theory, probabilities	2900	x234
1630E	Expected Components combinatorics, math, number theory, probabilities	2900	x279
1030G	Linear Congruential Generator number theory	2900	x299
896D	Nephren Runs a Cinema chinese remainder theorem, combinatorics, math, number theory	2900	x301
1622F	Quadratic Set constructive algorithms, hashing, math, number theory	2900	x364
1198F	GCD Groups 2 greedy, number theory, probabilities	2900	x503
1285F	Classical? binary search, combinatorics, number theory	2900	x717
585E	Present for Vitalik the Philatelist combinatorics, math, number theory	2900	x781
338D	GCD Table chinese remainder theorem, math, number theory	2900	x837
722F	Cyclic Cipher chinese remainder theorem, data structures, implementation, number theory, two pointers	2800	x355
1684G	Euclid Guess constructive algorithms, flows, graph matchings, math, number theory	2800	x363
1436F	Sum Over Subsets combinatorics, math, number theory	2800	x382
1626F	A Random Code Problem combinatorics, dp, math, number theory, probabilities	2800	x424
986E	Prince's Problem brute force, data structures, math, number theory, trees	2800	x542
633G	Yash And Trees bitmasks, data structures, dfs and similar, math, number theory	2800	x547
1208G	Polygons greedy, math, number theory	2800	x572
671C	Ultimate Weirdness of an Array data structures, number theory	2800	x576
1404D	Game of Pairs constructive algorithms, dfs and similar, interactive, math, number theory	2800	x722
774F	Pens And Days Of Week *special problem, binary search, number theory	2700	x88
774G	Perfectionist Arkadiy *special problem, number theory	2700	x117
1016G	Appropriate Team bitmasks, math, number theory	2700	x208
1468L	Prime Divisors Selection binary search, greedy, math, number theory	2700	x249
1182F	Maximum Sine binary search, data structures, number theory	2700	x255
838D	Airplane Arrangements math, number theory	2700	x360
1109E	Sasha and a Very Easy Test data structures, number theory	2700	x368
870F	Paths data structures, number theory	2700	x405
995E	Number Clicker divide and conquer, graphs, meet-in-the-middle, number theory	2700	x458
1034C	Region Separation combinatorics, dp, number theory, trees	2700	x561
1617E	Christmas Chocolates dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees	2700	x602
1422F	Boring Queries data structures, math, number theory	2700	x613
1292D	Chaotic V. dp, graphs, greedy, math, number theory, trees	2700	x643
1515G	Phoenix and Odometers dfs and similar, graphs, math, number theory	2700	x661
1553G	Common Divisor Graph brute force, constructive algorithms, dsu, graphs, hashing, math, number theory	2700	x777
961G	Partitions combinatorics, math, number theory	2700	x920
906D	Power Tower chinese remainder theorem, math, number theory	2700	x1250
1027G	X-mouse in the Campus bitmasks, math, number theory	2600	x241
303D	Rotatable Number math, number theory	2600	x244
185D	Visit of the Great math, number theory	2600	x288
1493F	Enchanted Matrix bitmasks, interactive, number theory	2600	x297
360D	Levko and Sets number theory	2600	x338
93E	Lostborn dp, math, number theory	2600	x343
1699E	Three Days Grace dp, greedy, math, number theory, two pointers	2600	x366
1582G	Kuzya and Homework data structures, number theory	2600	x398
542D	Superhero's Job dfs and similar, dp, hashing, math, number theory	2600	x432
1257G	Divisor Set divide and conquer, fft, greedy, math, number theory	2600	x455
963C	Cutting Rectangle brute force, math, number theory	2600	x476
703E	Mishka and Divisors dp, number theory	2600	x505
982E	Billiard geometry, number theory	2600	x523
235E	Number Challenge combinatorics, dp, implementation, math, number theory	2600	x572
1398G	Running Competition bitmasks, fft, math, number theory	2600	x583
1355F	Guess Divisors Count constructive algorithms, interactive, number theory	2600	x618
763C	Timofey and remoduling brute force, implementation, math, number theory	2600	x627
724G	Xor-matic Number of the Graph bitmasks, graphs, math, number theory, trees	2600	x734
1554E	You dfs and similar, dp, math, number theory	2600	x936
1278F	Cards combinatorics, dp, math, number theory, probabilities	2600	x1094
1406E	Deleting Numbers interactive, math, number theory	2600	x1238
1325E	Ehab's REAL Number Theory Problem brute force, dfs and similar, graphs, number theory, shortest paths	2600	x1488

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