Problemset - Codeforces

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Codeforces Round 940 (Div. 2) and CodeCraft-23
35:44:30
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number theory

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Problems

#	Name
1030D	Vasya and Triangle geometry, number theory	1800	x5669
1477A	Nezzar and Board constructive algorithms, math, number theory	1800	x5648
798C	Mike and gcd problem dp, greedy, number theory	1700	x5573
237C	Primes on Interval binary search, number theory, two pointers	1600	x5537
687B	Remainders Game chinese remainder theorem, math, number theory	1800	x5530
1750D	Count GCD combinatorics, math, number theory	1800	x5512
1547F	Array Stabilization (GCD version) binary search, brute force, data structures, divide and conquer, number theory, two pointers	1900	x5462
1499D	The Number of Pairs dp, math, number theory	2100	x5428
1713D	Tournament Countdown constructive algorithms, greedy, interactive, number theory, probabilities	1800	x5415
552C	Vanya and Scales brute force, dp, greedy, math, meet-in-the-middle, number theory	1900	x5380
1561D1	Up the Strip (simplified version) brute force, data structures, dp, math, number theory	1700	x5375
621C	Wet Shark and Flowers combinatorics, math, number theory, probabilities	1700	x5274
1749D	Counting Arrays combinatorics, dp, math, number theory	1900	x5225
1744E2	Divisible Numbers (hard version) brute force, math, number theory	1900	x5221
1781D	Many Perfect Squares brute force, math, number theory	1800	x5210
248B	Chilly Willy math, number theory	1400	x5183
1176D	Recover it! dfs and similar, graphs, greedy, number theory, sortings	1800	x5118
1367E	Necklace Assembly brute force, dfs and similar, dp, graphs, greedy, number theory	1900	x5117
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5090
914D	Bash and a Tough Math Puzzle data structures, number theory	1900	x5015
630K	Indivisibility math, number theory	1500	x5011
1513D	GCD and MST constructive algorithms, dsu, graphs, greedy, number theory, sortings	2000	x5007
568A	Primes or Palindromes? brute force, implementation, math, number theory	1600	x4998
923A	Primal Sport math, number theory	1700	x4963
1371E1	Asterism (Easy Version) binary search, brute force, combinatorics, math, number theory, sortings	1900	x4944
1485D	Multiples and Power Differences constructive algorithms, graphs, math, number theory	2200	x4924
68A	Irrational problem implementation, number theory	1100	x4790
1593D2	Half of Same brute force, math, number theory	1900	x4778
337C	Quiz binary search, greedy, math, matrices, number theory	1600	x4761
1493D	GCD of an Array brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers	2100	x4727
353C	Find Maximum implementation, math, number theory	1600	x4705
375A	Divisible by Seven math, number theory	1600	x4645
1423K	Lonely Numbers binary search, math, number theory, two pointers	1600	x4644
1010C	Border number theory	1800	x4641
1558B	Up the Strip brute force, dp, math, number theory, two pointers	1900	x4590
1579F	Array Stabilization (AND version) brute force, graphs, math, number theory, shortest paths	1700	x4556
16C	Monitor binary search, number theory	1800	x4481
1632D	New Year Concert binary search, data structures, greedy, math, number theory, two pointers	2000	x4447
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	x4403
1101D	GCD Counting data structures, dfs and similar, dp, number theory, trees	2000	x4388
894B	Ralph And His Magic Field combinatorics, constructive algorithms, math, number theory	1800	x4368
1812D	Trivial Conjecture *special problem, constructive algorithms, math, number theory		x4325
626C	Block Towers brute force, greedy, math, number theory	1600	x4284
678D	Iterated Linear Function math, number theory	1700	x4260
154B	Colliders math, number theory	1600	x4219
7C	Line math, number theory	1800	x4208
1188B	Count Pairs math, matrices, number theory, two pointers	2300	x4198
792C	Divide by Three dp, greedy, math, number theory	2000	x4163
1516D	Cut binary search, data structures, dp, graphs, number theory, two pointers	2100	x4072
1056B	Divide Candies math, number theory	1600	x4061
177B1	Rectangular Game number theory	1000	x3977
27E	Number With The Given Amount Of Divisors brute force, dp, number theory	2000	x3971
401D	Roman and Numbers bitmasks, brute force, combinatorics, dp, number theory	2000	x3959
1909D	Split Plus K greedy, math, number theory	1900	x3921
1333F	Kate and imperfection greedy, implementation, math, number theory, sortings, two pointers	2200	x3904
1144E	Median String bitmasks, math, number theory, strings	1900	x3900
439C	Devu and Partitioning of the Array brute force, constructive algorithms, implementation, number theory	1700	x3792
615D	Multipliers math, number theory	2000	x3777
294C	Shaass and Lights combinatorics, number theory	1900	x3701
1220D	Alex and Julian bitmasks, math, number theory	1900	x3684
1878F	Vasilije Loves Number Theory brute force, math, number theory	1900	x3671
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3671
1759F	All Possible Digits binary search, data structures, greedy, math, number theory	1800	x3670
1107D	Compression dp, implementation, math, number theory	1800	x3669
1614D1	Divan and Kostomuksha (easy version) dp, number theory	2100	x3640
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3639
55D	Beautiful numbers dp, number theory	2500	x3584
1468F	Full Turn geometry, hashing, number theory	1700	x3582
111B	Petya and Divisors binary search, data structures, number theory	1900	x3532
566F	Clique in the Divisibility Graph dp, math, number theory	1500	x3510
123A	Prime Permutation implementation, number theory, strings	1300	x3505
842C	Ilya And The Tree dfs and similar, graphs, math, number theory, trees	2000	x3404
632D	Longest Subsequence brute force, math, number theory	2100	x3352
1794D	Counting Factorizations combinatorics, divide and conquer, dp, math, number theory	1900	x3323
1025D	Recovering BST brute force, dp, math, number theory, trees	2100	x3294
498C	Array and Operations flows, graph matchings, number theory	2100	x3269
1762D	GCD Queries constructive algorithms, interactive, number theory	2100	x3267
893E	Counting Arrays combinatorics, dp, math, number theory	2000	x3235
963A	Alternating Sum math, number theory	1800	x3217
451E	Devu and Flowers bitmasks, combinatorics, number theory	2300	x3208
1210C	Kamil and Making a Stream math, number theory, trees	2000	x3200
665D	Simple Subset constructive algorithms, greedy, number theory	1800	x3189
1673D	Lost Arithmetic Progression combinatorics, math, number theory	1900	x3180
446C	DZY Loves Fibonacci Numbers data structures, math, number theory	2400	x3154
1419E	Decryption constructive algorithms, implementation, math, number theory	2100	x3131
1389E	Calendar Ambiguity math, number theory	2200	x3105
225B	Well-known Numbers binary search, greedy, number theory	1600	x3092
959D	Mahmoud and Ehab and another array construction task constructive algorithms, greedy, math, number theory	1900	x3042
66D	Petya and His Friends constructive algorithms, math, number theory	1700	x3040
1327D	Infinite Path brute force, dfs and similar, graphs, math, number theory	2200	x3017
803F	Coprime Subsequences bitmasks, combinatorics, number theory	2000	x2977
354C	Vasya and Beautiful Arrays brute force, dp, number theory	2100	x2966
900D	Unusual Sequences bitmasks, combinatorics, dp, math, number theory	2000	x2964
822D	My pretty girl Noora brute force, dp, greedy, math, number theory	1800	x2949
359C	Prime Number math, number theory	1900	x2927
1254B2	Send Boxes to Alice (Hard Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	2100	x2925
1718B	Fibonacci Strings greedy, implementation, math, number theory	2000	x2862
177B2	Rectangular Game number theory	1200	x2821
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x2797