Problemset - Codeforces

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Codeforces Round (Div. 2)
4 days
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Problems

#	Name
1557A	Ezzat and Two Subsequences brute force, math, sortings	800	x27905
1556H	DIY Tree graphs, greedy, math, probabilities	3300	x364
1556G	Gates to Another World bitmasks, data structures, dsu, two pointers	3300	x323
1556F	Sports Betting bitmasks, combinatorics, dp, graphs, math, probabilities	2500	x1241
1556E	Equilibrium data structures, dp, greedy	2200	x2707
1556D	Take a Guess bitmasks, constructive algorithms, interactive, math	1800	x6918
1556C	Compressed Bracket Sequence brute force, implementation	1800	x5788
1556B	Take Your Places! implementation	1300	x12692
1556A	A Variety of Operations math	800	x18068
1555F	Good Graph data structures, dsu, graphs, trees	2700	x852
1555E	Boring Segments data structures, sortings, trees, two pointers	2100	x4035
1555D	Say No to Palindromes brute force, constructive algorithms, dp, strings	1600	x12373
1555C	Coin Rows brute force, constructive algorithms, dp, implementation	1300	x21704
1555B	Two Tables brute force	1300	x16057
1555A	PizzaForces brute force, math	900	x28055
1554E	You dfs and similar, dp, math, number theory	2600	x1226
1554D	Diane constructive algorithms, greedy, strings	1800	x9454
1554C	Mikasa binary search, bitmasks, greedy, implementation	1800	x8869
1554B	Cobb bitmasks, brute force, greedy, math	1700	x12776
1554A	Cherry greedy	800	x29274
1553I	Stairs combinatorics, divide and conquer, dp, fft, math	3400	x203
1553H	XOR and Distance bitmasks, divide and conquer, trees	2900	x702
1553G	Common Divisor Graph brute force, constructive algorithms, dsu, graphs, hashing, math, number theory	2700	x1021
1553F	Pairwise Modulo data structures, math	2300	x2225
1553E	Permutation Shift brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math	2100	x3329
1553D	Backspace dp, greedy, strings, two pointers	1500	x13728
1553C	Penalty bitmasks, brute force, dp, greedy	1200	x17841
1553B	Reverse String brute force, dp, hashing, implementation, strings	1300	x14141
1553A	Digits Sum math, number theory	800	x30973
1552I	Organizing a Music Festival dfs and similar, math	3400	x128
1552H	Guess the Perimeter binary search, interactive, number theory	3300	x389
1552G	A Serious Referee bitmasks, brute force, dfs and similar, sortings	3000	x527
1552F	Telepanting binary search, data structures, dp, sortings	2200	x2911
1552E	Colors and Intervals constructive algorithms, data structures, greedy, sortings	2300	x1852
1552D	Array Differentiation bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math	1800	x7009
1552C	Maximize the Intersections combinatorics, constructive algorithms, geometry, greedy, sortings	1800	x5908
1552B	Running for Gold combinatorics, graphs, greedy, sortings	1500	x15414
1552A	Subsequence Permutation sortings, strings	800	x23843
1551F	Equidistant Vertices brute force, combinatorics, dfs and similar, dp, trees	2200	x1834
1551E	Fixed Points binary search, brute force, dp	2000	x3921
1551D2	Domino (hard version) constructive algorithms, implementation, math	2100	x2756
1551D1	Domino (easy version) constructive algorithms, math	1700	x7063
1551C	Interesting Story greedy, sortings, strings	1500	x13293
1551B2	Wonderful Coloring - 2 binary search, constructive algorithms, data structures, greedy	1400	x15499
1551B1	Wonderful Coloring - 1 greedy, strings	800	x29200
1551A	Polycarp and Coins greedy, math	800	x50783
1550F	Jumping Around binary search, data structures, divide and conquer, dp, dsu, graphs, shortest paths	2700	x669
1550E	Stringforces binary search, bitmasks, brute force, dp, strings, two pointers	2500	x1527
1550D	Excellent Arrays binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers	2300	x1843
1550C	Manhattan Subarrays brute force, geometry, greedy, implementation	1700	x10167
1550B	Maximum Cost Deletion greedy, math	1000	x26409
1550A	Find The Array greedy, math	800	x28102
1549B	Gregor and the Pawn Game dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation	800	x24350
1549A	Gregor and Cryptography math, number theory	800	x32431
1548E	Gregor and the Two Painters data structures, divide and conquer, graphs, greedy, math	3400	x452
1548D2	Gregor and the Odd Cows (Hard) brute force, geometry, math, number theory	3300	x246
1548D1	Gregor and the Odd Cows (Easy) bitmasks, geometry, math, number theory	2300	x1461
1548C	The Three Little Pigs combinatorics, dp, fft, math	2500	x1834
1548B	Integers Have Friends binary search, data structures, divide and conquer, math, number theory, two pointers	1800	x9817
1548A	Web of Lies brute force, graphs, greedy	1400	x16425
1547G	How Many Paths? dfs and similar, dp, graphs, trees	2100	x2997
1547F	Array Stabilization (GCD version) binary search, brute force, data structures, divide and conquer, number theory, two pointers	1900	x5820
1547E	Air Conditioners data structures, dp, implementation, shortest paths, sortings, two pointers	1500	x14437
1547D	Co-growing Sequence bitmasks, constructive algorithms, greedy	1300	x16677
1547C	Pair Programming greedy, two pointers	1100	x22628
1547B	Alphabetical Strings greedy, implementation, strings	800	x26383
1547A	Shortest Path with Obstacle implementation, math	800	x30429
1546B	AquaMoon and Stolen String interactive, math	1200	x13117
1546A	AquaMoon and Two Arrays brute force, greedy	800	x18201
1545F	AquaMoon and Potatoes brute force, data structures, dp	3500	x108
1545E2	AquaMoon and Time Stop (hard version) data structures, dp	3500	x86
1545E1	AquaMoon and Time Stop (easy version) data structures, dp	3500	x81
1545D	AquaMoon and Wrong Coordinate constructive algorithms, interactive, math	3000	x494
1545C	AquaMoon and Permutations 2-sat, brute force, combinatorics, constructive algorithms, graph matchings, graphs	2800	x615
1545B	AquaMoon and Chess combinatorics, math	1900	x5933
1545A	AquaMoon and Strange Sort sortings	1500	x13894
1543E	The Final Pursuit bitmasks, constructive algorithms, divide and conquer, graphs, greedy, math	2700	x413
1543D2	RPD and Rap Sheet (Hard Version) brute force, constructive algorithms, interactive, math	2200	x2015
1543D1	RPD and Rap Sheet (Easy Version) bitmasks, constructive algorithms, interactive, math	1700	x7598
1543C	Need for Pink Slips bitmasks, brute force, dfs and similar, implementation, math, probabilities	1900	x5289
1543B	Customising the Track combinatorics, greedy, math	900	x23078
1543A	Exciting Bets greedy, math, number theory	900	x28202
1542E2	Abnormal Permutation Pairs (hard version) combinatorics, dp, fft, math	2700	x851
1542E1	Abnormal Permutation Pairs (easy version) combinatorics, dp, fft, math	2400	x1242
1542D	Priority Queue combinatorics, dp, implementation, math, ternary search	2200	x2625
1542C	Strange Function math, number theory	1600	x14198
1542B	Plus and Multiply constructive algorithms, math, number theory	1500	x23098
1542A	Odd Set math	800	x44644
1541B	Pleasant Pairs brute force, implementation, math, number theory	1200	x28470
1541A	Pretty Permutations constructive algorithms, greedy, implementation	800	x29400
1540E	Tasty Dishes math, matrices	3500	x105
1540D	Inverse Inversions binary search, brute force, data structures	3200	x277
1540C2	Converging Array (Hard Version) dp, math	2900	x456
1540C1	Converging Array (Easy Version) dp, math	2700	x624
1540B	Tree Array brute force, combinatorics, dp, graphs, math, probabilities, trees	2300	x2607
1540A	Great Graphs constructive algorithms, graphs, greedy, shortest paths, sortings	1400	x13928
1539F	Strange Array data structures, greedy, sortings	2600	x862
1539E	Game with Cards binary search, constructive algorithms, data structures, dp, greedy, implementation	2500	x948
1539D	PriceFixed binary search, greedy, implementation, sortings, two pointers	1600	x11638
1539C	Stable Groups greedy, sortings	1200	x22872