Problemset - Codeforces

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number theory

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Problems

#	Name
1184A1	Heidi Learns Hashing (Easy) brute force, math, number theory	1200	x5852
1775D	Friendly Spiders dfs and similar, graphs, math, number theory, shortest paths	1800	x5752
1359E	Modular Stability combinatorics, math, number theory	2000	x5725
1030D	Vasya and Triangle geometry, number theory	1800	x5675
1477A	Nezzar and Board constructive algorithms, math, number theory	1800	x5670
798C	Mike and gcd problem dp, greedy, number theory	1700	x5580
237C	Primes on Interval binary search, number theory, two pointers	1600	x5566
1750D	Count GCD combinatorics, math, number theory	1800	x5555
687B	Remainders Game chinese remainder theorem, math, number theory	1800	x5546
1547F	Array Stabilization (GCD version) binary search, brute force, data structures, divide and conquer, number theory, two pointers	1900	x5494
1499D	The Number of Pairs dp, math, number theory	2100	x5454
1713D	Tournament Countdown constructive algorithms, greedy, interactive, number theory, probabilities	1800	x5441
1561D1	Up the Strip (simplified version) brute force, data structures, dp, math, number theory	1700	x5387
552C	Vanya and Scales brute force, dp, greedy, math, meet-in-the-middle, number theory	1900	x5385
621C	Wet Shark and Flowers combinatorics, math, number theory, probabilities	1700	x5292
1744E2	Divisible Numbers (hard version) brute force, math, number theory	1900	x5265
1749D	Counting Arrays combinatorics, dp, math, number theory	1900	x5259
1781D	Many Perfect Squares brute force, math, number theory	1800	x5234
248B	Chilly Willy math, number theory	1400	x5191
1367E	Necklace Assembly brute force, dfs and similar, dp, graphs, greedy, number theory	1900	x5127
1176D	Recover it! dfs and similar, graphs, greedy, number theory, sortings	1800	x5126
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5110
914D	Bash and a Tough Math Puzzle data structures, number theory	1900	x5044
1513D	GCD and MST constructive algorithms, dsu, graphs, greedy, number theory, sortings	2000	x5038
630K	Indivisibility math, number theory	1500	x5026
568A	Primes or Palindromes? brute force, implementation, math, number theory	1600	x4999
923A	Primal Sport math, number theory	1700	x4969
1371E1	Asterism (Easy Version) binary search, brute force, combinatorics, math, number theory, sortings	1900	x4950
1485D	Multiples and Power Differences constructive algorithms, graphs, math, number theory	2200	x4938
68A	Irrational problem implementation, number theory	1100	x4814
1593D2	Half of Same brute force, math, number theory	1900	x4791
337C	Quiz binary search, greedy, math, matrices, number theory	1600	x4769
1493D	GCD of an Array brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers	2100	x4737
353C	Find Maximum implementation, math, number theory	1600	x4723
1423K	Lonely Numbers binary search, math, number theory, two pointers	1600	x4659
375A	Divisible by Seven math, number theory	1600	x4658
1010C	Border number theory	1800	x4653
1558B	Up the Strip brute force, dp, math, number theory, two pointers	1900	x4607
1579F	Array Stabilization (AND version) brute force, graphs, math, number theory, shortest paths	1700	x4566
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x4536
16C	Monitor binary search, number theory	1800	x4498
1632D	New Year Concert binary search, data structures, greedy, math, number theory, two pointers	2000	x4461
1195D2	Submarine in the Rybinsk Sea (hard edition) combinatorics, math, number theory	1800	x4445
1254B1	Send Boxes to Alice (Easy Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	1800	x4410
1101D	GCD Counting data structures, dfs and similar, dp, number theory, trees	2000	x4406
894B	Ralph And His Magic Field combinatorics, constructive algorithms, math, number theory	1800	x4376
1812D	Trivial Conjecture *special problem, constructive algorithms, math, number theory		x4336
626C	Block Towers brute force, greedy, math, number theory	1600	x4287
678D	Iterated Linear Function math, number theory	1700	x4274
7C	Line math, number theory	1800	x4234
154B	Colliders math, number theory	1600	x4233
1188B	Count Pairs math, matrices, number theory, two pointers	2300	x4217
792C	Divide by Three dp, greedy, math, number theory	2000	x4195
1516D	Cut binary search, data structures, dp, graphs, number theory, two pointers	2100	x4091
1056B	Divide Candies math, number theory	1600	x4065
1144E	Median String bitmasks, math, number theory, strings	1900	x4050
27E	Number With The Given Amount Of Divisors brute force, dp, number theory	2000	x3991
177B1	Rectangular Game number theory	1000	x3990
401D	Roman and Numbers bitmasks, brute force, combinatorics, dp, number theory	2000	x3968
1909D	Split Plus K greedy, math, number theory	1900	x3967
1333F	Kate and imperfection greedy, implementation, math, number theory, sortings, two pointers	2200	x3917
439C	Devu and Partitioning of the Array brute force, constructive algorithms, implementation, number theory	1700	x3797
615D	Multipliers math, number theory	2000	x3786
294C	Shaass and Lights combinatorics, number theory	1900	x3714
1878F	Vasilije Loves Number Theory brute force, math, number theory	1900	x3704
1759F	All Possible Digits binary search, data structures, greedy, math, number theory	1800	x3694
1220D	Alex and Julian bitmasks, math, number theory	1900	x3688
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3687
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3685
1107D	Compression dp, implementation, math, number theory	1800	x3676
1614D1	Divan and Kostomuksha (easy version) dp, number theory	2100	x3650
55D	Beautiful numbers dp, number theory	2500	x3600
1468F	Full Turn geometry, hashing, number theory	1700	x3587
111B	Petya and Divisors binary search, data structures, number theory	1900	x3540
566F	Clique in the Divisibility Graph dp, math, number theory	1500	x3523
123A	Prime Permutation implementation, number theory, strings	1300	x3515
842C	Ilya And The Tree dfs and similar, graphs, math, number theory, trees	2000	x3412
632D	Longest Subsequence brute force, math, number theory	2100	x3378
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x3341
1794D	Counting Factorizations combinatorics, divide and conquer, dp, math, number theory	1900	x3341
1025D	Recovering BST brute force, dp, math, number theory, trees	2100	x3297
498C	Array and Operations flows, graph matchings, number theory	2100	x3295
1762D	GCD Queries constructive algorithms, interactive, number theory	2100	x3286
893E	Counting Arrays combinatorics, dp, math, number theory	2000	x3260
451E	Devu and Flowers bitmasks, combinatorics, number theory	2300	x3238
963A	Alternating Sum math, number theory	1800	x3221
665D	Simple Subset constructive algorithms, greedy, number theory	1800	x3206
1210C	Kamil and Making a Stream math, number theory, trees	2000	x3203
1673D	Lost Arithmetic Progression combinatorics, math, number theory	1900	x3192
446C	DZY Loves Fibonacci Numbers data structures, math, number theory	2400	x3178
1419E	Decryption constructive algorithms, implementation, math, number theory	2100	x3139
1389E	Calendar Ambiguity math, number theory	2200	x3109
225B	Well-known Numbers binary search, greedy, number theory	1600	x3103
1327D	Infinite Path brute force, dfs and similar, graphs, math, number theory	2200	x3051
66D	Petya and His Friends constructive algorithms, math, number theory	1700	x3046
959D	Mahmoud and Ehab and another array construction task constructive algorithms, greedy, math, number theory	1900	x3044
803F	Coprime Subsequences bitmasks, combinatorics, number theory	2000	x2989
900D	Unusual Sequences bitmasks, combinatorics, dp, math, number theory	2000	x2977
354C	Vasya and Beautiful Arrays brute force, dp, number theory	2100	x2972
822D	My pretty girl Noora brute force, dp, greedy, math, number theory	1800	x2960