Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Problems

#	Name
1641A	Great Sequence brute force, greedy, sortings	1200	x17899
1638F	Two Posters brute force, data structures, greedy, two pointers	3200	x226
1638E	Colorful Operations brute force, data structures, implementation	2400	x1910
1638D	Big Brush constructive algorithms, data structures, greedy, implementation	2000	x4200
1638C	Inversion Graph data structures, dsu, graphs, math	1300	x14681
1638B	Odd Swap Sort data structures, math, sortings	1100	x20847
1638A	Reverse constructive algorithms, greedy, math	800	x21459
1637H	Minimize Inversions Number data structures, greedy, math, sortings	3500	x315
1637G	Birthday constructive algorithms, greedy, math	3000	x503
1637F	Towers constructive algorithms, dfs and similar, dp, greedy, trees	2500	x1774
1637E	Best Pair binary search, brute force, implementation	2100	x3343
1637D	Yet Another Minimization Problem dp, greedy, math	1800	x7719
1637C	Andrew and Stones greedy, implementation	1200	x17734
1637B	MEX and Array brute force, dp, greedy, math	1100	x14804
1637A	Sorting Parts brute force, sortings	800	x22298
1635F	Closest Pair data structures, greedy	2800	x1106
1635E	Cars 2-sat, constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings	2200	x2222
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6254
1635C	Differential Sorting constructive algorithms, greedy	1200	x17572
1635B	Avoid Local Maximums greedy	800	x17933
1635A	Min Or Sum bitmasks, greedy	800	x22912
1634F	Fibonacci Additions brute force, data structures, hashing, implementation, math	2700	x1599
1634E	Fair Share constructive algorithms, data structures, dfs and similar, graph matchings, graphs	2400	x1700
1634D	Finding Zero constructive algorithms, interactive, math	2000	x4374
1634C	OKEA constructive algorithms	1000	x18185
1634B	Fortune Telling bitmasks, math	1400	x16611
1634A	Reverse and Concatenate greedy, strings	800	x23878
1633F	Perfect Matching data structures, divide and conquer, interactive, trees	2800	x318
1633E	Spanning Tree Queries binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees	2400	x1528
1633D	Make Them Equal dp, greedy	1600	x14053
1633C	Kill the Monster brute force, math	1100	x20056
1633B	Minority greedy	800	x27778
1633A	Div. 7 brute force	800	x33035
1632E2	Distance Tree (hard version) binary search, dfs and similar, shortest paths, trees	2700	x982
1632E1	Distance Tree (easy version) binary search, data structures, dfs and similar, graphs, shortest paths, trees	2400	x1163
1632D	New Year Concert binary search, data structures, greedy, math, number theory, two pointers	2000	x4668
1632C	Strange Test binary search, bitmasks, brute force, dp, math	1600	x12728
1632B	Roof Construction bitmasks, constructive algorithms	1000	x22307
1632A	ABC implementation	800	x29468
1631B	Fun with Even Subarrays dp, greedy	1100	x20367
1631A	Min Max Swap greedy	800	x29078
1630F	Making It Bipartite flows, graph matchings, graphs, number theory	3400	x571
1630E	Expected Components combinatorics, math, number theory, probabilities	2900	x437
1630D	Flipping Range constructive algorithms, dp, greedy, number theory	2400	x1639
1630C	Paint the Middle dp, greedy, sortings, two pointers	2200	x2939
1630B	Range and Partition binary search, constructive algorithms, data structures, greedy, two pointers	1800	x5746
1630A	And Matching bitmasks, constructive algorithms	1500	x14539
1629B	GCD Arrays greedy, math, number theory	800	x23420
1629A	Download More RAM brute force, greedy, sortings	800	x29016
1628F	Spaceship Crisis Management binary search, data structures, geometry, sortings	3500	x88
1628E	Groceries in Meteor Town binary search, data structures, dsu, trees	3100	x884
1628D2	Game on Sum (Hard Version) combinatorics, dp, games, math	2400	x2106
1628D1	Game on Sum (Easy Version) combinatorics, dp, games, math	2100	x3167
1628C	Grid Xor constructive algorithms, greedy, implementation, interactive, math	2300	x3183
1628B	Peculiar Movie Preferences greedy, strings	1700	x11609
1628A	Meximum Array binary search, constructive algorithms, greedy, implementation, math, two pointers	1400	x15618
1627F	Not Splitting geometry, graphs, greedy, implementation, shortest paths	2700	x587
1627E	Not Escaping data structures, dp, implementation, shortest paths, two pointers	2200	x2377
1627D	Not Adding brute force, dp, math, number theory	1900	x8277
1627C	Not Assigning constructive algorithms, dfs and similar, number theory, trees	1400	x14533
1627B	Not Sitting games, greedy, sortings	1300	x16629
1627A	Not Shading constructive algorithms, implementation	800	x24016
1626F	A Random Code Problem combinatorics, dp, math, number theory, probabilities	2800	x732
1626E	Black and White Tree dfs and similar, greedy, trees	2400	x1574
1626D	Martial Arts Tournament binary search, brute force, greedy, math	2100	x3920
1626C	Monsters And Spells binary search, data structures, dp, greedy, implementation, math, two pointers	1700	x10909
1626B	Minor Reduction greedy, strings	1100	x22811
1626A	Equidistant Letters constructive algorithms, sortings	800	x28775
1625E2	Cats on the Upgrade (hard version) binary search, data structures, dfs and similar, graphs, trees	2800	x594
1625E1	Cats on the Upgrade (easy version) brute force, data structures, dfs and similar, divide and conquer, dp, graphs, trees	2500	x1041
1625D	Binary Spiders bitmasks, data structures, implementation, math, sortings, trees	2300	x2052
1625C	Road Optimization dp	1700	x10677
1625B	Elementary Particles brute force, greedy, sortings	1100	x16083
1625A	Ancient Civilization bitmasks, greedy, math	800	x17216
1624G	MinOr Tree bitmasks, dfs and similar, dsu, graphs, greedy	1900	x5931
1624F	Interacdive Problem binary search, constructive algorithms, interactive	2000	x3334
1624E	Masha-forgetful brute force, constructive algorithms, dp, hashing, implementation, strings	2000	x4100
1624D	Palindromes Coloring binary search, greedy, sortings, strings	1400	x16997
1624C	Division by Two and Permutation constructive algorithms, flows, graph matchings, greedy, math	1100	x24838
1624B	Make AP implementation, math	900	x36766
1624A	Plus One on the Subset math	800	x51852
1623E	Middle Duplication data structures, dfs and similar, greedy, strings, trees	2500	x1098
1623D	Robot Cleaner Revisit implementation, math, probabilities	2300	x1376
1623C	Balanced Stone Heaps binary search, greedy	1600	x12153
1623B	Game on Ranges brute force, dfs and similar, implementation, sortings	1100	x14090
1623A	Robot Cleaner brute force, implementation, math	800	x20033
1622F	Quadratic Set constructive algorithms, hashing, math, number theory	2900	x658
1622E	Math Test bitmasks, brute force, greedy	2200	x1897
1622D	Shuffle combinatorics, math, two pointers	2000	x4053
1622C	Set or Decrease binary search, brute force, greedy, sortings	1600	x13089
1622B	Berland Music data structures, greedy, math, sortings	1000	x20931
1622A	Construct a Rectangle geometry, math	800	x30076
1621I	Two Sequences data structures, hashing, string suffix structures	3500	x117
1621H	Trains and Airplanes dfs and similar, graphs, shortest paths, trees	3500	x179
1621G	Weighted Increasing Subsequences data structures, dp, math	3200	x651
1621F	Strange Instructions data structures, greedy, implementation	2700	x552
1621E	New School binary search, data structures, dp, greedy, implementation, sortings	2300	x1757
1621D	The Winter Hike constructive algorithms, greedy, math	2100	x4064
1621C	Hidden Permutations dfs and similar, interactive, math	1700	x6908
1621B	Integers Shop data structures, greedy, implementation	1500	x13411