Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Problems

#	Name
1699B	Almost Ternary Matrix bitmasks, constructive algorithms, matrices	900	x19742
1699A	The Third Three Number Problem constructive algorithms, math	800	x23998
1698G	Long Binary String bitmasks, math, matrices, meet-in-the-middle, number theory	2900	x315
1698F	Equal Reversal constructive algorithms, graphs, implementation, math	2800	x623
1698E	PermutationForces II brute force, combinatorics, greedy, sortings, trees, two pointers	2300	x1640
1698D	Fixed Point Guessing binary search, constructive algorithms, interactive	1600	x9302
1698C	3SUM Closure brute force, data structures	1300	x18502
1698B	Rising Sand constructive algorithms, greedy, implementation	800	x20908
1698A	XOR Mixup bitmasks, brute force	800	x29034
1697F	Too Many Constraints 2-sat, constructive algorithms, graphs, implementation	2800	x561
1697E	Coloring brute force, combinatorics, constructive algorithms, dp, geometry, graphs, greedy, implementation, math	2400	x1209
1697D	Guess The String binary search, constructive algorithms, interactive	1900	x4442
1697C	awoo's Favorite Problem binary search, constructive algorithms, data structures, greedy, implementation, strings, two pointers	1400	x14357
1697B	Promo greedy, sortings	900	x26582
1697A	Parkway Walk greedy, implementation	800	x25727
1696H	Maximum Product? brute force, combinatorics, dp, greedy, implementation, math, two pointers	3500	x161
1696G	Fishingprince Plays With Array Again brute force, data structures, geometry, math	3300	x276
1696F	Tree Recovery brute force, constructive algorithms, dfs and similar, dsu, graphs, trees	2600	x884
1696E	Placing Jinas combinatorics, math	2000	x4045
1696D	Permutation Graph binary search, constructive algorithms, data structures, divide and conquer, greedy, shortest paths	1900	x5457
1696C	Fishingprince Plays With Array constructive algorithms, greedy, implementation, math	1400	x11630
1696B	NIT Destroys the Universe greedy	900	x21337
1696A	NIT orz! bitmasks, greedy	800	x18772
1695E	Ambiguous Dominoes constructive algorithms, dfs and similar, graphs	2700	x448
1695D2	Tree Queries (Hard Version) constructive algorithms, dfs and similar, dp, greedy, trees	2300	x1998
1695D1	Tree Queries (Easy Version) brute force, constructive algorithms, dfs and similar, dp, greedy, trees	2200	x2176
1695C	Zero Path brute force, data structures, dp, graphs, greedy, shortest paths	1700	x10938
1695B	Circle Game games, greedy	1000	x18473
1695A	Subrectangle Guess games	800	x16338
1694B	Paranoid String constructive algorithms, greedy	1200	x19124
1694A	Creep greedy, implementation	800	x22655
1693F	I Might Be Wrong binary search, greedy, two pointers	3400	x409
1693E	Outermost Maximums data structures, greedy	3400	x422
1693D	Decinc Dividing brute force, data structures, divide and conquer, dp, greedy	2800	x839
1693C	Keshi in Search of AmShZ graphs, greedy, shortest paths	2300	x2583
1693B	Fake Plastic Trees dfs and similar, dp, greedy, trees	1700	x8471
1693A	Directional Increase greedy	1300	x16144
1692H	Gambling data structures, dp, greedy, math	1700	x7468
1692G	2^Sort data structures, dp, sortings, two pointers	1400	x17735
1692F	3SUM brute force, math	1300	x22811
1692E	Binary Deque binary search, implementation, two pointers	1200	x21976
1692D	The Clock brute force, implementation	1100	x19415
1692C	Where's the Bishop? implementation	800	x34125
1692B	All Distinct greedy, sortings	800	x34151
1692A	Marathon implementation	800	x65050
1691F	K-Set Tree combinatorics, dfs and similar, dp, math, trees	2500	x972
1691E	Number of Groups data structures, dfs and similar, dsu, graphs, greedy, sortings	2300	x1830
1691D	Max GEQ Sum binary search, constructive algorithms, data structures, divide and conquer, implementation, two pointers	1800	x5814
1691C	Sum of Substrings brute force, constructive algorithms, greedy, math, strings	1400	x15655
1691B	Shoe Shuffling constructive algorithms, greedy, implementation, two pointers	1000	x23083
1691A	Beat The Odds brute force, greedy, math	800	x30521
1690G	Count the Trains binary search, data structures, greedy, sortings	2000	x3388
1690F	Shifting String graphs, math, number theory, strings	1700	x7163
1690E	Price Maximization binary search, greedy, math, two pointers	1500	x15191
1690D	Black and White Stripe implementation, two pointers	1000	x29604
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	x33473
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	x4214
1689C	Infected Tree dfs and similar, dp, trees	1600	x11225
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	x8148
1688B	Patchouli's Magical Talisman bitmasks, constructive algorithms, greedy, sortings	800	x18269
1688A	Cirno's Perfect Bitmasks Classroom bitmasks, brute force	800	x21624
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	x10382
1686B	Odd Subarrays dp, greedy	800	x18258
1686A	Everything Everywhere All But One greedy	800	x20484
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	x17105
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	x20951
1684A	Digit Minimization constructive algorithms, games, math, strings	800	x23874
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	x9623
1681C	Double Sort implementation, sortings	1200	x17373
1681B	Card Trick implementation, math	800	x20099
1681A	Game with Cards games, greedy	800	x20969