Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round 941 (Div. 1)
14:41:41
Register now »

*has extra registration

Before contest
Codeforces Round 941 (Div. 2)
14:41:41
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

number theory

Add tag

Problems

#	Name
1030D	Vasya and Triangle geometry, number theory	1800	x5672
1477A	Nezzar and Board constructive algorithms, math, number theory	1800	x5656
798C	Mike and gcd problem dp, greedy, number theory	1700	x5575
237C	Primes on Interval binary search, number theory, two pointers	1600	x5541
687B	Remainders Game chinese remainder theorem, math, number theory	1800	x5535
1750D	Count GCD combinatorics, math, number theory	1800	x5531
1547F	Array Stabilization (GCD version) binary search, brute force, data structures, divide and conquer, number theory, two pointers	1900	x5483
1499D	The Number of Pairs dp, math, number theory	2100	x5440
1713D	Tournament Countdown constructive algorithms, greedy, interactive, number theory, probabilities	1800	x5428
552C	Vanya and Scales brute force, dp, greedy, math, meet-in-the-middle, number theory	1900	x5381
1561D1	Up the Strip (simplified version) brute force, data structures, dp, math, number theory	1700	x5379
621C	Wet Shark and Flowers combinatorics, math, number theory, probabilities	1700	x5279
1744E2	Divisible Numbers (hard version) brute force, math, number theory	1900	x5241
1749D	Counting Arrays combinatorics, dp, math, number theory	1900	x5239
1781D	Many Perfect Squares brute force, math, number theory	1800	x5220
248B	Chilly Willy math, number theory	1400	x5187
1176D	Recover it! dfs and similar, graphs, greedy, number theory, sortings	1800	x5125
1367E	Necklace Assembly brute force, dfs and similar, dp, graphs, greedy, number theory	1900	x5124
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5095
914D	Bash and a Tough Math Puzzle data structures, number theory	1900	x5028
1513D	GCD and MST constructive algorithms, dsu, graphs, greedy, number theory, sortings	2000	x5019
630K	Indivisibility math, number theory	1500	x5015
568A	Primes or Palindromes? brute force, implementation, math, number theory	1600	x4998
923A	Primal Sport math, number theory	1700	x4965
1371E1	Asterism (Easy Version) binary search, brute force, combinatorics, math, number theory, sortings	1900	x4947
1485D	Multiples and Power Differences constructive algorithms, graphs, math, number theory	2200	x4929
68A	Irrational problem implementation, number theory	1100	x4799
1593D2	Half of Same brute force, math, number theory	1900	x4786
337C	Quiz binary search, greedy, math, matrices, number theory	1600	x4765
1493D	GCD of an Array brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers	2100	x4732
353C	Find Maximum implementation, math, number theory	1600	x4711
1423K	Lonely Numbers binary search, math, number theory, two pointers	1600	x4649
375A	Divisible by Seven math, number theory	1600	x4648
1010C	Border number theory	1800	x4644
1558B	Up the Strip brute force, dp, math, number theory, two pointers	1900	x4596
1579F	Array Stabilization (AND version) brute force, graphs, math, number theory, shortest paths	1700	x4560
16C	Monitor binary search, number theory	1800	x4489
1632D	New Year Concert binary search, data structures, greedy, math, number theory, two pointers	2000	x4452
1195D2	Submarine in the Rybinsk Sea (hard edition) combinatorics, math, number theory	1800	x4411
1254B1	Send Boxes to Alice (Easy Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	1800	x4406
1101D	GCD Counting data structures, dfs and similar, dp, number theory, trees	2000	x4392
894B	Ralph And His Magic Field combinatorics, constructive algorithms, math, number theory	1800	x4370
1812D	Trivial Conjecture *special problem, constructive algorithms, math, number theory		x4331
626C	Block Towers brute force, greedy, math, number theory	1600	x4286
678D	Iterated Linear Function math, number theory	1700	x4261
154B	Colliders math, number theory	1600	x4224
7C	Line math, number theory	1800	x4224
1188B	Count Pairs math, matrices, number theory, two pointers	2300	x4207
792C	Divide by Three dp, greedy, math, number theory	2000	x4177
1516D	Cut binary search, data structures, dp, graphs, number theory, two pointers	2100	x4080
1056B	Divide Candies math, number theory	1600	x4065
1144E	Median String bitmasks, math, number theory, strings	1900	x3999
177B1	Rectangular Game number theory	1000	x3987
27E	Number With The Given Amount Of Divisors brute force, dp, number theory	2000	x3980
401D	Roman and Numbers bitmasks, brute force, combinatorics, dp, number theory	2000	x3965
1909D	Split Plus K greedy, math, number theory	1900	x3942
1333F	Kate and imperfection greedy, implementation, math, number theory, sortings, two pointers	2200	x3906
439C	Devu and Partitioning of the Array brute force, constructive algorithms, implementation, number theory	1700	x3795
615D	Multipliers math, number theory	2000	x3782
294C	Shaass and Lights combinatorics, number theory	1900	x3708
1878F	Vasilije Loves Number Theory brute force, math, number theory	1900	x3684
1220D	Alex and Julian bitmasks, math, number theory	1900	x3684
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3677
1759F	All Possible Digits binary search, data structures, greedy, math, number theory	1800	x3676
1107D	Compression dp, implementation, math, number theory	1800	x3669
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3667
1614D1	Divan and Kostomuksha (easy version) dp, number theory	2100	x3647
55D	Beautiful numbers dp, number theory	2500	x3589
1468F	Full Turn geometry, hashing, number theory	1700	x3585
111B	Petya and Divisors binary search, data structures, number theory	1900	x3534
566F	Clique in the Divisibility Graph dp, math, number theory	1500	x3516
123A	Prime Permutation implementation, number theory, strings	1300	x3511
842C	Ilya And The Tree dfs and similar, graphs, math, number theory, trees	2000	x3410
632D	Longest Subsequence brute force, math, number theory	2100	x3362
1794D	Counting Factorizations combinatorics, divide and conquer, dp, math, number theory	1900	x3334
1025D	Recovering BST brute force, dp, math, number theory, trees	2100	x3294
1762D	GCD Queries constructive algorithms, interactive, number theory	2100	x3274
498C	Array and Operations flows, graph matchings, number theory	2100	x3272
893E	Counting Arrays combinatorics, dp, math, number theory	2000	x3253
963A	Alternating Sum math, number theory	1800	x3220
451E	Devu and Flowers bitmasks, combinatorics, number theory	2300	x3213
1210C	Kamil and Making a Stream math, number theory, trees	2000	x3201
665D	Simple Subset constructive algorithms, greedy, number theory	1800	x3194
1673D	Lost Arithmetic Progression combinatorics, math, number theory	1900	x3185
446C	DZY Loves Fibonacci Numbers data structures, math, number theory	2400	x3168
1419E	Decryption constructive algorithms, implementation, math, number theory	2100	x3137
1389E	Calendar Ambiguity math, number theory	2200	x3106
225B	Well-known Numbers binary search, greedy, number theory	1600	x3096
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x3061
959D	Mahmoud and Ehab and another array construction task constructive algorithms, greedy, math, number theory	1900	x3044
66D	Petya and His Friends constructive algorithms, math, number theory	1700	x3042
1327D	Infinite Path brute force, dfs and similar, graphs, math, number theory	2200	x3023
803F	Coprime Subsequences bitmasks, combinatorics, number theory	2000	x2982
900D	Unusual Sequences bitmasks, combinatorics, dp, math, number theory	2000	x2969
354C	Vasya and Beautiful Arrays brute force, dp, number theory	2100	x2968
822D	My pretty girl Noora brute force, dp, greedy, math, number theory	1800	x2952
359C	Prime Number math, number theory	1900	x2932
1254B2	Send Boxes to Alice (Hard Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	2100	x2929
1718B	Fibonacci Strings greedy, implementation, math, number theory	2000	x2870
177B2	Rectangular Game number theory	1200	x2824