Problemset - Codeforces

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Codeforces Round 940 (Div. 2) and CodeCraft-23
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bitmasks

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Problems

#	Name
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x2329
1955H	The Most Reckless Defense bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths	2300	x817
1952I	Dark Matter bitmasks, geometry		x299
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x3084
1950F	0, 1, 2, Tree! bitmasks, brute force, greedy, implementation, trees	1700	x6882
1948G	MST with Matching bitmasks, brute force, dsu, graph matchings, trees	3100	x557
1946D	Birthday Gift bitmasks, brute force, constructive algorithms, greedy, implementation	1900	x3774
1944B	Equal XOR bitmasks, constructive algorithms	1100	x13700
1936D	Bitwise Paradox binary search, bitmasks, data structures, greedy, two pointers	3100	x394
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x6378
1935E	Distance Learning Courses in MAC bitmasks, brute force, data structures, greedy, math	2400	x1120
1934D2	XOR Break --- Game Version bitmasks, games, greedy, interactive	2400	x1145
1934D1	XOR Break --- Solo Version bitmasks, constructive algorithms, greedy	2100	x2973
1933G	Turtle Magic: Royal Turtle Shell Pattern bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math	2300	x837
1930F	Maximize the Difference bitmasks, brute force, dfs and similar	2700	x587
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2318
1929E	Sasha and the Happy Tree Cutting bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees	2300	x1465
1926F	Vlad and Avoiding X bitmasks, brute force, dfs and similar, dp, implementation	2200	x1423
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x9656
1926D	Vlad and Division bitmasks, greedy	1300	x13196
1922E	Increasing Subsequences bitmasks, constructive algorithms, divide and conquer, greedy, math	1800	x6925
1918C	XOR-distance bitmasks, greedy, implementation, math	1400	x12307
1917F	Construct Tree bitmasks, constructive algorithms, dp, trees	2500	x880
1915B	Not Quite Latin Square bitmasks, brute force, implementation	800	x37938
1915A	Odd One Out bitmasks, implementation	800	x48704
1913C	Game with Multiset binary search, bitmasks, brute force, greedy	1300	x13433
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x1927
1909E	Multiple Lamps bitmasks, brute force, constructive algorithms, math, number theory	2400	x1224
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x13569
1906B	Button Pressing bitmasks, constructive algorithms, hashing	2600	x450
1903D2	Maximum And Queries (hard version) bitmasks, divide and conquer, dp, greedy	2500	x696
1903D1	Maximum And Queries (easy version) binary search, bitmasks, brute force, greedy	1700	x4987
1903B	StORage room bitmasks, brute force, constructive algorithms, greedy	1200	x11170
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3636
1895D	XOR Construction bitmasks, constructive algorithms, data structures, math, string suffix structures, trees	1900	x5497
1886E	I Wanna be the Team Leader bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers	2400	x1309
1883E	Look Back bitmasks, greedy	1700	x6835
1882D	Tree XOR bitmasks, dfs and similar, dp, greedy, trees	1900	x4900
1882B	Sets and Union bitmasks, brute force, constructive algorithms, greedy	1300	x14148
1879D	Sum of XOR Functions bitmasks, combinatorics, divide and conquer, dp, math	1700	x6470
1878G	wxhtzdy ORO Tree binary search, bitmasks, brute force, data structures, dfs and similar, implementation, trees	2300	x1079
1878E	Iva & Pav binary search, bitmasks, data structures, greedy	1400	x10837
1875C	Jellyfish and Green Apple bitmasks, greedy, math, number theory	1400	x10674
1874B	Jellyfish and Math bitmasks, brute force, dfs and similar, dp, graphs, shortest paths	2400	x1047
1872E	Data Structures Fan binary search, bitmasks, data structures, dp	1500	x11723
1870E	Another MEX Problem bitmasks, brute force, dp, shortest paths	2300	x2185
1870B	Friendly Arrays bitmasks, greedy, math	1200	x13248
1868B2	Candy Party (Hard Version) bitmasks, constructive algorithms, dp, greedy, implementation, math	2100	x2253
1868B1	Candy Party (Easy Version) bitmasks, constructive algorithms, graphs, greedy, implementation, math	1700	x6376
1867B	XOR Palindromes bitmasks, constructive algorithms, strings	1100	x15662
1864E	Guess Game bitmasks, data structures, games, math, probabilities, sortings, strings, trees	2100	x2454
1864C	Divisor Chain bitmasks, constructive algorithms, math, number theory	1300	x12505
1863F	Divide, XOR, and Conquer bitmasks, dp, math	2600	x989
1862F	Magic Will Save the World binary search, bitmasks, brute force, dp	1800	x5580
1861F	Four Suits binary search, bitmasks, flows, greedy	3200	x144
1856E2	PermuTree (hard version) bitmasks, dfs and similar, dp, fft, greedy, implementation, math, trees	2700	x1297
1854B	Earn or Unlock bitmasks, brute force, dp	2200	x3294
1851F	Lisa and the Martians bitmasks, greedy, math, strings, trees	1800	x5233
1849F	XOR Partition binary search, bitmasks, data structures, divide and conquer, greedy, trees	2700	x619
1848F	Vika and Wiki binary search, bitmasks, combinatorics, divide and conquer, dp, math	2400	x1433
1847F	The Boss's Identity binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings	2500	x845
1847C	Vampiric Powers, anyone? bitmasks, brute force, dp, greedy	1400	x12133
1847B	Hamon Odyssey bitmasks, greedy, two pointers	1000	x18971
1846G	Rudolf and CodeVid-23 bitmasks, dp, graphs, greedy, shortest paths	1900	x3995
1844G	Tree Weights bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees	3000	x632
1843C	Sum in Binary Tree bitmasks, combinatorics, math, trees	800	x30869
1842H	Tenzing and Random Real Numbers bitmasks, dp, graphs, math, probabilities	3000	x554
1842B	Tenzing and Books bitmasks, greedy, math	1100	x15481
1840B	Binary Cafe bitmasks, combinatorics, math	1100	x21375
1835F	Good Graph bitmasks, dfs and similar, graph matchings, graphs, implementation	3500	x134
1835C	Twin Clusters bitmasks, brute force, constructive algorithms, math, probabilities	2600	x924
1829H	Don't Blame Me bitmasks, combinatorics, dp, math	1700	x6957
1829C	Mr. Perfectly Fine bitmasks, greedy, implementation	800	x26906
1826E	Walk the Runway bitmasks, brute force, data structures, dp, graphs, implementation, sortings	2400	x1487
1815D	XOR Counting bitmasks, combinatorics, dp, math	2600	x1017
1807G2	Subsequence Addition (Hard Version) bitmasks, dp, greedy, implementation, sortings	1100	x17518
1805A	We Need the Zero bitmasks, brute force	800	x20737
1804H	Code Lock bitmasks, dp	3300	x168
1804E	Routing bitmasks, brute force, dfs and similar, dp, graphs	2400	x1351
1801A	The Very Beautiful Blanket bitmasks, constructive algorithms	1600	x8054
1800F	Dasha and Nightmares bitmasks, hashing, meet-in-the-middle, strings	1900	x3656
1799H	Tree Cutting bitmasks, dfs and similar, dp	3200	x269
1795G	Removal Sequences bitmasks, dfs and similar, graphs	2700	x641
1792D	Fixed Prefix Permutations binary search, bitmasks, data structures, hashing, math, sortings	1700	x5842
1790E	Vlad and a Pair of Numbers bitmasks, constructive algorithms	1400	x14088
1789F	Serval and Brain Power bitmasks, brute force, dp, greedy, implementation, strings	2700	x508
1789D	Serval and Shift-Shift-Shift bitmasks, brute force, constructive algorithms, implementation	2200	x1557
1788F	XOR, Tree, and Queries bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees	2500	x776
1787E	The Harmonization of XOR bitmasks, constructive algorithms, greedy, math	2100	x2162
1780F	Three Chairs bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings	2300	x1360
1780D	Bit Guessing Game binary search, bitmasks, constructive algorithms, interactive	1800	x4625
1779F	Xorcerer's Stones bitmasks, constructive algorithms, dp, trees	2500	x1212
1778E	The Tree Has Fallen! bitmasks, dfs and similar, math, trees	2500	x789
1778C	Flexible String bitmasks, brute force, strings	1600	x7597
1777F	Comfortably Numb bitmasks, data structures, divide and conquer, strings, trees	2400	x806
1777D	Score of a Tree bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees	1900	x3186
1775C	Interesting Sequence bitmasks, math	1600	x9542
1775B	Gardener and the Array bitmasks, constructive algorithms	1300	x12294
1773G	Game of Questions bitmasks, combinatorics, dp, fft, math, probabilities	2800	x317
1771F	Hossam and Range Minimum Query binary search, bitmasks, data structures, hashing, probabilities, strings, trees	2500	x945

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