Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Problems

#	Name
1709C	Recover an RBS constructive algorithms, greedy, implementation, strings	1800	x8864
1707B	Difference Array brute force, data structures, implementation, sortings	1900	x5734
1707A	Doremy's IQ binary search, constructive algorithms, greedy, implementation	1600	x13581
1706D1	Chopping Carrots (Easy Version) binary search, brute force, constructive algorithms, greedy, number theory	1700	x6948
1706C	Qpwoeirut And The City dp, flows, greedy, implementation	1400	x14892
1705D	Mark and Lightbulbs combinatorics, constructive algorithms, greedy, math, sortings	1800	x6341
1705C	Mark and His Unfinished Essay brute force, implementation	1400	x13341
1704D	Magical Array constructive algorithms, hashing, implementation, math	1900	x5021
1703G	Good Key, Bad Key bitmasks, brute force, dp, greedy, math	1600	x10674
1703F	Yet Another Problem About Pairs Satisfying an Inequality binary search, data structures, dp, greedy, sortings	1300	x20037
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	x13304
1701D	Permutation Restoration binary search, data structures, greedy, math, sortings, two pointers	1900	x5682
1701C	Schedule Management binary search, greedy, implementation, two pointers	1400	x17025
1700D	River Locks binary search, dp, greedy, math	1900	x6098
1700C	Helping the Nature constructive algorithms, data structures, greedy	1700	x10924
1699C	The Third Problem combinatorics, constructive algorithms, math	1700	x9764
1698D	Fixed Point Guessing binary search, constructive algorithms, interactive	1600	x9302
1698C	3SUM Closure brute force, data structures	1300	x18501
1697D	Guess The String binary search, constructive algorithms, interactive	1900	x4441
1697C	awoo's Favorite Problem binary search, constructive algorithms, data structures, greedy, implementation, strings, two pointers	1400	x14357
1696D	Permutation Graph binary search, constructive algorithms, data structures, divide and conquer, greedy, shortest paths	1900	x5456
1696C	Fishingprince Plays With Array constructive algorithms, greedy, implementation, math	1400	x11630
1695C	Zero Path brute force, data structures, dp, graphs, greedy, shortest paths	1700	x10936
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	x7467
1692G	2^Sort data structures, dp, sortings, two pointers	1400	x17733
1692F	3SUM brute force, math	1300	x22808
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	x15653
1690F	Shifting String graphs, math, number theory, strings	1700	x7160
1690E	Price Maximization binary search, greedy, math, two pointers	1500	x15189
1689D	Lena and Matrix data structures, dp, geometry, shortest paths	1900	x4214
1689C	Infected Tree dfs and similar, dp, trees	1600	x11225
1688C	Manipulating History constructive algorithms, greedy, strings	1700	x8147
1687B	Railway System constructive algorithms, graphs, greedy, interactive, sortings	1700	x3643
1687A	The Enchanted Forest brute force, greedy	1600	x10379
1684D	Traps constructive algorithms, greedy, sortings	1700	x9664
1684C	Column Swapping brute force, constructive algorithms, greedy, implementation, sortings	1400	x12316
1682C	LIS or Reverse LIS? constructive algorithms, greedy, implementation, math	1400	x14740
1681D	Required Length brute force, dfs and similar, dp, hashing, shortest paths	1700	x9622
1680C	Binary String binary search, greedy, strings, two pointers	1600	x9926
1679D	Toss a Coin to Your Graph... binary search, dfs and similar, dp, graphs	1900	x4841
1679C	Rooks Defenders data structures, implementation	1400	x10312
1678B2	Tokitsukaze and Good 01-String (hard version) dp, greedy, implementation	1800	x6609
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	x10742
1676H1	Maximum Crossings (Easy Version) brute force	1400	x14034
1676G	White-Black Balanced Subtrees dfs and similar, dp, graphs, trees	1300	x15681
1676F	Longest Strike data structures, greedy, implementation, sortings, two pointers	1300	x16712
1675F	Vlad and Unfinished Business dfs and similar, dp, greedy, trees	1800	x5328
1675E	Replace With the Previous, Minimize dsu, greedy, strings	1500	x10628
1675D	Vertical Paths graphs, implementation, trees	1300	x13076
1674F	Desktop Rearrangement data structures, greedy, implementation	1800	x5053
1673D	Lost Arithmetic Progression combinatorics, math, number theory	1900	x3310
1673C	Palindrome Basis brute force, dp, math, number theory	1500	x12744
1672D	Cyclic Rotation constructive algorithms, greedy, implementation, two pointers	1700	x6229
1671D	Insert a Progression brute force, constructive algorithms, greedy	1600	x7651
1670D	Very Suspicious binary search, brute force, geometry, greedy, implementation, math	1700	x5135
1670C	Where is the Pizza? data structures, dfs and similar, dsu, graphs, implementation, math	1400	x9955
1669H	Maximal AND bitmasks, greedy, math	1300	x18606
1667A	Make it Increasing brute force, greedy, math	1300	x14700
1666L	Labyrinth dfs and similar, graphs	1800	x3110
1666C	Connect the Points brute force, constructive algorithms, geometry	1800	x3178
1665C	Tree Infection binary search, greedy, sortings, trees	1600	x8368
1661D	Progressions Covering data structures, greedy	1900	x4737
1661C	Water the Trees binary search, greedy, math	1700	x9327
1661B	Getting Zero bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths	1300	x17726
1660F1	Promising String (easy version) brute force, implementation, math, strings	1700	x7272
1660E	Matrix and Shifts brute force, constructive algorithms, greedy, implementation	1600	x7305
1660D	Maximum Product Strikes Back brute force, implementation, math, two pointers	1600	x8660
1660C	Get an Even String dp, greedy, strings	1300	x19559
1659D	Reverse Sort Sum constructive algorithms, data structures, greedy, implementation, math, two pointers	1900	x4008
1659C	Line Empire binary search, brute force, dp, greedy, implementation, math	1500	x10491
1659B	Bit Flipping bitmasks, constructive algorithms, greedy, strings	1300	x10931
1658D1	388535 (Easy Version) bitmasks, math	1600	x9073
1658C	Shinju and the Lost Permutation constructive algorithms, math	1700	x9322
1656D	K-good constructive algorithms, math, number theory	1900	x6867
1654C	Alice and the Cake data structures, greedy, implementation, sortings	1400	x13485
1651D	Nearest Excluded Points binary search, data structures, dfs and similar, graphs, shortest paths	1900	x5125
1651C	Fault-tolerant Network brute force, data structures, implementation	1500	x10706
1650E	Rescheduling the Exam binary search, data structures, greedy, implementation, math, sortings	1900	x4143
1650D	Twist the Permutation brute force, constructive algorithms, implementation, math	1300	x13022
1649B	Game of Ball Passing greedy, implementation	1300	x13030
1648C	Tyler and Strings combinatorics, data structures, implementation	1900	x2984
1648B	Integral Array brute force, constructive algorithms, data structures, math	1800	x6438
1648A	Weird Sum combinatorics, data structures, geometry, math, matrices, sortings	1400	x12835
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5281
1647C	Madoka and Childish Pranks constructive algorithms, greedy	1300	x12593
1646C	Factorials and Powers of Two bitmasks, brute force, constructive algorithms, dp, math	1500	x14122
1644E	Expand the Path brute force, combinatorics, data structures, implementation, math	1900	x3099
1644D	Cross Coloring data structures, implementation, math	1700	x7235
1644C	Increase Subarray Sums brute force, dp, greedy, implementation	1400	x13769
1638C	Inversion Graph data structures, dsu, graphs, math	1300	x14680
1637D	Yet Another Minimization Problem dp, greedy, math	1800	x7717
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6254