Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Problems

#	Name
1690E	Price Maximization binary search, greedy, math, two pointers	1500	x15191
1690D	Black and White Stripe implementation, two pointers	1000	x29606
1690C	Restoring the Duration of Tasks data structures, greedy, implementation	800	x26115
1690B	Array Decrements greedy, implementation	800	x25306
1690A	Print a Pedestal (Codeforces logo?) constructive algorithms, greedy	800	x33474
1689E	ANDfinity bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs	2500	x1210
1689D	Lena and Matrix data structures, dp, geometry, shortest paths	1900	x4215
1689C	Infected Tree dfs and similar, dp, trees	1600	x11226
1689B	Mystic Permutation data structures, greedy	900	x17537
1689A	Lex String brute force, greedy, implementation, sortings, two pointers	800	x16781
1688C	Manipulating History constructive algorithms, greedy, strings	1700	x8149
1688B	Patchouli's Magical Talisman bitmasks, constructive algorithms, greedy, sortings	800	x18270
1688A	Cirno's Perfect Bitmasks Classroom bitmasks, brute force	800	x21626
1687F	Koishi's Unconscious Permutation fft, math	3500	x84
1687E	Become Big For Me combinatorics, constructive algorithms, greedy, math, number theory	3500	x226
1687D	Cute number binary search, brute force, data structures, dsu, implementation, math	2900	x591
1687C	Sanae and Giant Robot binary search, brute force, data structures, dsu, greedy, sortings	2500	x1413
1687B	Railway System constructive algorithms, graphs, greedy, interactive, sortings	1700	x3644
1687A	The Enchanted Forest brute force, greedy	1600	x10383
1686B	Odd Subarrays dp, greedy	800	x18258
1686A	Everything Everywhere All But One greedy	800	x20486
1685E	The Ultimate LIS Problem data structures, greedy	3500	x150
1685D2	Permutation Weight (Hard Version) constructive algorithms, greedy	3500	x107
1685D1	Permutation Weight (Easy Version) constructive algorithms, dfs and similar, dsu	2800	x444
1685C	Bring Balance brute force, constructive algorithms, greedy	2600	x1012
1685B	Linguistics greedy, implementation, sortings, strings	2000	x3272
1685A	Circular Local MiniMax constructive algorithms, greedy, sortings	1100	x17107
1684H	Hard Cut constructive algorithms, dfs and similar, divide and conquer, math	3400	x239
1684G	Euclid Guess constructive algorithms, flows, graph matchings, math, number theory	2800	x610
1684F	Diverse Segments data structures, two pointers	2600	x902
1684E	MEX vs DIFF binary search, brute force, constructive algorithms, data structures, greedy, two pointers	2100	x3162
1684D	Traps constructive algorithms, greedy, sortings	1700	x9664
1684C	Column Swapping brute force, constructive algorithms, greedy, implementation, sortings	1400	x12316
1684B	Z mod X = C constructive algorithms, math	800	x20954
1684A	Digit Minimization constructive algorithms, games, math, strings	800	x23876
1682F	MCMF? data structures, flows, graphs, greedy, sortings, two pointers	2700	x314
1682E	Unordered Swaps constructive algorithms, dfs and similar, graphs, greedy, math, sortings, trees	2700	x599
1682D	Circular Spanning Tree constructive algorithms, implementation, trees	2000	x3305
1682C	LIS or Reverse LIS? constructive algorithms, greedy, implementation, math	1400	x14740
1682B	AND Sorting bitmasks, constructive algorithms, sortings	1100	x18573
1682A	Palindromic Indices greedy, strings	800	x19279
1681F	Unique Occurrences data structures, dfs and similar, divide and conquer, dp, dsu, trees	2300	x1761
1681E	Labyrinth Adventures data structures, dp, matrices, shortest paths	2600	x796
1681D	Required Length brute force, dfs and similar, dp, hashing, shortest paths	1700	x9627
1681C	Double Sort implementation, sortings	1200	x17374
1681B	Card Trick implementation, math	800	x20099
1681A	Game with Cards games, greedy	800	x20969
1680F	Lenient Vertex Cover dfs and similar, divide and conquer, dsu, graphs, trees	2600	x666
1680E	Moving Chips bitmasks, dp, greedy	2000	x3791
1680D	Dog Walking brute force, greedy, math	2400	x1167
1680C	Binary String binary search, greedy, strings, two pointers	1600	x9927
1680B	Robots implementation	800	x18309
1680A	Minimums and Maximums brute force, math	800	x21570
1679F	Formalism for Formalism bitmasks, dp, math	2600	x541
1679E	Typical Party in Dorm bitmasks, combinatorics, dp, strings	2400	x1180
1679D	Toss a Coin to Your Graph... binary search, dfs and similar, dp, graphs	1900	x4842
1679C	Rooks Defenders data structures, implementation	1400	x10312
1679B	Stone Age Problem data structures, implementation	1200	x18484
1679A	AvtoBus brute force, greedy, math, number theory	900	x24167
1678B2	Tokitsukaze and Good 01-String (hard version) dp, greedy, implementation	1800	x6609
1678B1	Tokitsukaze and Good 01-String (easy version) implementation	800	x15925
1678A	Tokitsukaze and All Zero Sequence implementation	800	x18145
1677F	Tokitsukaze and Gems dp, math	3500	x93
1677E	Tokitsukaze and Beautiful Subsegments data structures	2900	x551
1677D	Tokitsukaze and Permutations dp, math	2500	x1257
1677C	Tokitsukaze and Two Colorful Tapes constructive algorithms, dfs and similar, graphs, greedy	1900	x3592
1677B	Tokitsukaze and Meeting data structures, implementation, math	1700	x4177
1677A	Tokitsukaze and Strange Inequality brute force, data structures, dp	1600	x8432
1676H2	Maximum Crossings (Hard Version) data structures, divide and conquer, sortings	1500	x10749
1676H1	Maximum Crossings (Easy Version) brute force	1400	x14040
1676G	White-Black Balanced Subtrees dfs and similar, dp, graphs, trees	1300	x15690
1676F	Longest Strike data structures, greedy, implementation, sortings, two pointers	1300	x16719
1676E	Eating Queries binary search, greedy, sortings	1100	x26348
1676D	X-Sum brute force, greedy, implementation	1000	x25161
1676C	Most Similar Words brute force, greedy, implementation, implementation, math, strings	800	x30134
1676B	Equal Candies greedy, math, sortings	800	x48382
1676A	Lucky? implementation	800	x63820
1675G	Sorting Pancakes dp	2300	x1773
1675F	Vlad and Unfinished Business dfs and similar, dp, greedy, trees	1800	x5328
1675E	Replace With the Previous, Minimize dsu, greedy, strings	1500	x10630
1675D	Vertical Paths graphs, implementation, trees	1300	x13076
1675C	Detective Task implementation	1100	x18219
1675B	Make It Increasing greedy, implementation	900	x27068
1675A	Food for Animals greedy, math	800	x32967
1674G	Remove Directed Edges dfs and similar, dp, graphs	2000	x2498
1674F	Desktop Rearrangement data structures, greedy, implementation	1800	x5053
1674E	Breaking the Wall binary search, brute force, constructive algorithms, greedy, math	2000	x6420
1674D	A-B-C Sort constructive algorithms, implementation, sortings	1200	x16341
1674C	Infinite Replacement combinatorics, implementation, strings	1000	x23610
1674B	Dictionary combinatorics, math	800	x26299
1674A	Number Transformation constructive algorithms, math	800	x26265
1673F	Anti-Theft Road Planning bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math	2400	x822
1673E	Power or XOR? bitmasks, combinatorics, math, number theory	2500	x709
1673D	Lost Arithmetic Progression combinatorics, math, number theory	1900	x3310
1673C	Palindrome Basis brute force, dp, math, number theory	1500	x12745
1673B	A Perfectly Balanced String? brute force, greedy, strings	1100	x15210
1673A	Subtle Substring Subtraction games, greedy, strings	800	x18438
1672I	PermutationForces data structures, greedy	3000	x172
1672H	Zigu Zagu constructive algorithms, data structures, greedy	2700	x948
1672G	Cross Xor constructive algorithms, graphs, math, matrices	3200	x323