Problemset - Codeforces

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Codeforces Round (Div. 2)
4 days
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Problems

#	Name
1722G	Even-Odd XOR bitmasks, constructive algorithms, greedy	1500	x11289
1722F	L-shapes dfs and similar, implementation	1700	x6932
1722E	Counting Rectangles brute force, data structures, dp, implementation	1600	x10808
1722D	Line greedy, sortings	1100	x23199
1722C	Word Game data structures, implementation	800	x30899
1722B	Colourblindness implementation	800	x45949
1722A	Spell Check implementation	800	x50390
1721F	Matching Reduction brute force, constructive algorithms, dfs and similar, flows, graph matchings, graphs, interactive	2800	x400
1721E	Prefix Function Queries dfs and similar, dp, hashing, string suffix structures, strings, trees	2200	x1974
1721D	Maximum AND bitmasks, dfs and similar, divide and conquer, greedy, sortings	1800	x6619
1721C	Min-Max Array Transformation binary search, greedy, two pointers	1400	x13363
1721B	Deadly Laser implementation	1000	x22178
1721A	Image greedy, implementation	800	x26993
1720E	Misha and Paintings constructive algorithms, data structures, greedy, implementation, math	2700	x803
1720D2	Xor-Subsequence (hard version) bitmasks, data structures, dp, strings, trees	2400	x1840
1720D1	Xor-Subsequence (easy version) bitmasks, brute force, dp, strings, trees, two pointers	1800	x5980
1720C	Corners greedy, implementation	1200	x16785
1720B	Interesting Sum brute force, data structures, greedy, math, sortings	800	x21177
1720A	Burenka Plays with Fractions math, number theory	900	x22381
1719C	Fighting Tournament binary search, data structures, implementation, two pointers	1400	x13223
1719B	Mathematical Circus constructive algorithms, math	800	x18522
1719A	Chip Game games, math	800	x25507
1718F	Burenka, an Array and Queries data structures, math, number theory	3300	x153
1718E	Impressionism constructive algorithms, graphs, implementation, math	3500	x109
1718D	Permutation for Burenka data structures, graph matchings, greedy, math, trees	3300	x303
1718C	Tonya and Burenka-179 data structures, greedy, math, number theory	2400	x1611
1718B	Fibonacci Strings greedy, implementation, math, number theory	2000	x3002
1718A2	Burenka and Traditions (hard version) data structures, dp, greedy	1900	x5228
1718A1	Burenka and Traditions (easy version) dp, greedy	1800	x5756
1717F	Madoka and The First Session constructive algorithms, flows, graph matchings, graphs, implementation	2500	x529
1717E	Madoka and The Best University math, number theory	2200	x2717
1717D	Madoka and The Corruption Scheme combinatorics, constructive algorithms, greedy, math	1900	x4404
1717C	Madoka and Formal Statement greedy	1300	x14644
1717B	Madoka and Underground Competitions constructive algorithms, implementation	1100	x14772
1717A	Madoka and Strange Thoughts math, number theory	800	x19460
1716F	Bags with Balls combinatorics, dp, math, number theory	2500	x1045
1716E	Swap and Maximum Block bitmasks, data structures, dfs and similar, divide and conquer, dp	2500	x1091
1716D	Chip Move brute force, dp, math	2000	x5253
1716C	Robot in a Hallway data structures, dp, greedy, implementation, ternary search	2000	x4185
1716B	Permutation Chain constructive algorithms, math	800	x21406
1716A	2-3 Moves greedy, math	800	x32761
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	x1720
1715D	2+ doors 2-sat, bitmasks, graphs, greedy	1900	x5136
1715C	Monoblock combinatorics, data structures, implementation, math	1700	x8622
1715B	Beautiful Array constructive algorithms, greedy, math	1000	x21831
1715A	Crossmarket constructive algorithms, greedy, math	800	x23528
1714G	Path Prefixes binary search, data structures, dfs and similar, trees	1700	x7572
1714F	Build a Tree and That Is It constructive algorithms, implementation, trees	1900	x3223
1714E	Add Modulo 10 brute force, math, number theory	1400	x16543
1714D	Color with Occurrences brute force, data structures, dp, greedy, strings	1600	x9070
1714C	Minimum Varied Number greedy	800	x30979
1714B	Remove Prefix data structures, greedy, implementation	800	x30224
1714A	Everyone Loves to Sleep implementation, math	900	x29649
1713F	Lost Array bitmasks, combinatorics, constructive algorithms, dp, math	2900	x536
1713E	Cross Swapping 2-sat, data structures, dsu, greedy, matrices	2400	x1653
1713D	Tournament Countdown constructive algorithms, greedy, interactive, number theory, probabilities	1800	x5677
1713C	Build Permutation constructive algorithms, dp, math	1200	x17359
1713B	Optimal Reduction constructive algorithms, sortings	1000	x21276
1713A	Traveling Salesman Problem geometry, greedy, implementation	800	x21984
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	x1263
1712E1	LCM Sum (easy version) binary search, brute force, combinatorics, math, number theory, two pointers	2300	x2152
1712D	Empty Graph binary search, constructive algorithms, data structures, greedy, shortest paths	2000	x4489
1712C	Sort Zero greedy, sortings	1100	x19803
1712B	Woeful Permutation constructive algorithms, greedy, number theory	800	x21562
1712A	Wonderful Permutation greedy, implementation	800	x24045
1711B	Party brute force, graphs	1300	x13402
1711A	Perfect Permutation constructive algorithms	800	x25144
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	x1366
1710B	Rain binary search, brute force, data structures, geometry, greedy, implementation, math	2100	x2460
1710A	Color the Picture constructive algorithms, greedy, math	1500	x10892
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	x2704
1709D	Rorororobot binary search, data structures, greedy, math	1700	x8397
1709C	Recover an RBS constructive algorithms, greedy, implementation, strings	1800	x8854
1709B	Also Try Minecraft data structures, dp, implementation	900	x22681
1709A	Three Doors brute force, greedy, implementation, math	800	x29585
1708B	Difference of GCDs constructive algorithms, math	1100	x20665
1708A	Difference Operations greedy, math	800	x21755
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	x1494
1707B	Difference Array brute force, data structures, implementation, sortings	1900	x5729
1707A	Doremy's IQ binary search, constructive algorithms, greedy, implementation	1600	x13558
1706E	Qpwoeirut and Vertices binary search, data structures, dfs and similar, divide and conquer, dsu, greedy, trees	2300	x2653
1706D2	Chopping Carrots (Hard Version) brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers	2400	x1703
1706D1	Chopping Carrots (Easy Version) binary search, brute force, constructive algorithms, greedy, number theory	1700	x6936
1706C	Qpwoeirut And The City dp, flows, greedy, implementation	1400	x14879
1706B	Making Towers dp, greedy, math	1100	x16544
1706A	Another String Minimization Problem 2-sat, constructive algorithms, greedy, string suffix structures, strings	800	x22946
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	x2069
1705D	Mark and Lightbulbs combinatorics, constructive algorithms, greedy, math, sortings	1800	x6338
1705C	Mark and His Unfinished Essay brute force, implementation	1400	x13333
1705B	Mark the Dust Sweeper constructive algorithms, greedy, implementation	900	x22972
1705A	Mark the Photographer greedy, sortings	800	x25240