Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Problems

#	Name
1716B	Permutation Chain constructive algorithms, math	800	x21411
1716A	2-3 Moves greedy, math	800	x32791
1715F	Crop Squares constructive algorithms, geometry, interactive, math	2700	x524
1715E	Long Way Home data structures, divide and conquer, dp, geometry, graphs, greedy, shortest paths	2400	x1724
1715D	2+ doors 2-sat, bitmasks, graphs, greedy	1900	x5144
1715C	Monoblock combinatorics, data structures, implementation, math	1700	x8636
1715B	Beautiful Array constructive algorithms, greedy, math	1000	x21881
1715A	Crossmarket constructive algorithms, greedy, math	800	x23539
1714G	Path Prefixes binary search, data structures, dfs and similar, trees	1700	x7595
1714F	Build a Tree and That Is It constructive algorithms, implementation, trees	1900	x3235
1714E	Add Modulo 10 brute force, math, number theory	1400	x16570
1714D	Color with Occurrences brute force, data structures, dp, greedy, strings	1600	x9079
1714C	Minimum Varied Number greedy	800	x30992
1714B	Remove Prefix data structures, greedy, implementation	800	x30274
1714A	Everyone Loves to Sleep implementation, math	900	x29665
1713F	Lost Array bitmasks, combinatorics, constructive algorithms, dp, math	2900	x536
1713E	Cross Swapping 2-sat, data structures, dsu, greedy, matrices	2400	x1684
1713D	Tournament Countdown constructive algorithms, greedy, interactive, number theory, probabilities	1800	x5680
1713C	Build Permutation constructive algorithms, dp, math	1200	x17374
1713B	Optimal Reduction constructive algorithms, sortings	1000	x21286
1713A	Traveling Salesman Problem geometry, greedy, implementation	800	x21988
1712F	Triameter binary search, data structures, dfs and similar, trees	3200	x313
1712E2	LCM Sum (hard version) brute force, data structures, math, number theory, two pointers	2500	x1267
1712E1	LCM Sum (easy version) binary search, brute force, combinatorics, math, number theory, two pointers	2300	x2155
1712D	Empty Graph binary search, constructive algorithms, data structures, greedy, shortest paths	2000	x4489
1712C	Sort Zero greedy, sortings	1100	x19810
1712B	Woeful Permutation constructive algorithms, greedy, number theory	800	x21572
1712A	Wonderful Permutation greedy, implementation	800	x24057
1711B	Party brute force, graphs	1300	x13405
1711A	Perfect Permutation constructive algorithms	800	x25151
1710E	Two Arrays binary search, games, graph matchings	2400	x505
1710D	Recover the Tree constructive algorithms, trees	3400	x420
1710C	XOR Triangle bitmasks, brute force, constructive algorithms, dp, greedy, math	2500	x1369
1710B	Rain binary search, brute force, data structures, geometry, greedy, implementation, math	2100	x2461
1710A	Color the Picture constructive algorithms, greedy, math	1500	x10897
1709F	Multiset of Strings bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees	2500	x549
1709E	XOR Tree bitmasks, data structures, dfs and similar, dsu, greedy, trees	2400	x2713
1709D	Rorororobot binary search, data structures, greedy, math	1700	x8408
1709C	Recover an RBS constructive algorithms, greedy, implementation, strings	1800	x8864
1709B	Also Try Minecraft data structures, dp, implementation	900	x22735
1709A	Three Doors brute force, greedy, implementation, math	800	x29611
1708B	Difference of GCDs constructive algorithms, math	1100	x20702
1708A	Difference Operations greedy, math	800	x21768
1707F	Bugaboo bitmasks, constructive algorithms, dp, number theory	3500	x152
1707E	Replace binary search, data structures	3500	x621
1707D	Partial Virtual Trees combinatorics, dfs and similar, dp, math, trees	3000	x619
1707C	DFS Trees dfs and similar, dsu, graphs, greedy, sortings, trees	2400	x1502
1707B	Difference Array brute force, data structures, implementation, sortings	1900	x5734
1707A	Doremy's IQ binary search, constructive algorithms, greedy, implementation	1600	x13582
1706E	Qpwoeirut and Vertices binary search, data structures, dfs and similar, divide and conquer, dsu, greedy, trees	2300	x2660
1706D2	Chopping Carrots (Hard Version) brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers	2400	x1704
1706D1	Chopping Carrots (Easy Version) binary search, brute force, constructive algorithms, greedy, number theory	1700	x6949
1706C	Qpwoeirut And The City dp, flows, greedy, implementation	1400	x14892
1706B	Making Towers dp, greedy, math	1100	x16553
1706A	Another String Minimization Problem 2-sat, constructive algorithms, greedy, string suffix structures, strings	800	x22956
1705F	Mark and the Online Exam bitmasks, constructive algorithms, interactive, probabilities	2900	x607
1705E	Mark and Professor Koro binary search, bitmasks, brute force, combinatorics, data structures, greedy	2300	x2071
1705D	Mark and Lightbulbs combinatorics, constructive algorithms, greedy, math, sortings	1800	x6341
1705C	Mark and His Unfinished Essay brute force, implementation	1400	x13341
1705B	Mark the Dust Sweeper constructive algorithms, greedy, implementation	900	x22985
1705A	Mark the Photographer greedy, sortings	800	x25247
1704H2	Game of AI (hard version) combinatorics, fft, math	3500	x85
1704H1	Game of AI (easy version) combinatorics, constructive algorithms, dp, fft, math	3200	x180
1704G	Mio and Lucky Array constructive algorithms, fft, math, strings	3500	x113
1704F	Colouring Game constructive algorithms, dp, games	2600	x1039
1704E	Count Seconds brute force, constructive algorithms, dp, graphs, implementation, math	2200	x2345
1704D	Magical Array constructive algorithms, hashing, implementation, math	1900	x5023
1704C	Virus greedy, implementation, sortings	1200	x15796
1704B	Luke is a Foodie brute force, greedy, implementation	1000	x18053
1704A	Two 0-1 Sequences constructive algorithms, greedy	800	x16019
1703G	Good Key, Bad Key bitmasks, brute force, dp, greedy, math	1600	x10676
1703F	Yet Another Problem About Pairs Satisfying an Inequality binary search, data structures, dp, greedy, sortings	1300	x20039
1703E	Mirror Grid implementation	1200	x18349
1703D	Double Strings brute force, data structures, strings	1100	x25622
1703C	Cypher brute force, implementation, strings	800	x35547
1703B	ICPC Balloons data structures, implementation	800	x49023
1703A	YES or YES? brute force, implementation, strings	800	x69368
1702G2	Passable Paths (hard version) data structures, dfs and similar, trees	2000	x4652
1702G1	Passable Paths (easy version) dfs and similar, trees	1900	x5440
1702F	Equate Multisets constructive algorithms, data structures, greedy, math, number theory	1700	x8386
1702E	Split Into Two Sets dfs and similar, dsu, graphs	1600	x13307
1702D	Not a Cheap String greedy	1000	x23687
1702C	Train and Queries data structures, greedy	1100	x22237
1702B	Polycarp Writes a String from Memory greedy	800	x27585
1702A	Round Down the Price constructive algorithms	800	x34763
1701F	Points combinatorics, data structures, implementation, math, matrices	2500	x935
1701E	Text Editor brute force, dp, greedy, strings	2500	x1124
1701D	Permutation Restoration binary search, data structures, greedy, math, sortings, two pointers	1900	x5682
1701C	Schedule Management binary search, greedy, implementation, two pointers	1400	x17026
1701B	Permutation greedy	800	x20195
1701A	Grass Field implementation	800	x26268
1700F	Puzzle constructive algorithms, dp, greedy	2600	x935
1700E	Serega the Pirate brute force, constructive algorithms	2600	x853
1700D	River Locks binary search, dp, greedy, math	1900	x6098
1700C	Helping the Nature constructive algorithms, data structures, greedy	1700	x10924
1700B	Palindromic Numbers constructive algorithms, implementation, math	1100	x18726
1700A	Optimal Path constructive algorithms, greedy, math	800	x22871
1699E	Three Days Grace data structures, dp, greedy, math, number theory, two pointers	2600	x1164
1699D	Almost Triple Deletions data structures, dp, greedy	2300	x3144
1699C	The Third Problem combinatorics, constructive algorithms, math	1700	x9765