Problemset - Codeforces

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Codeforces Round (Div. 2)
6 days

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Problems

#	Name
89C	Chip Play brute force, data structures, implementation	2300	x610
89B	Widget Library dp, expression parsing, graphs, implementation	2300	x511
89A	Robbery greedy	1800	x1459
88B	Keyboard implementation	1500	x4444
87E	Mogohu-Rea Idol geometry	2600	x555
87D	Beautiful Road dfs and similar, dp, dsu, graphs, implementation, sortings, trees	2300	x860
87C	Interesting Game dp, games, math	2000	x1313
87B	Vasya and Types implementation, strings	1800	x1119
87A	Trains implementation, math	1500	x5234
86E	Long sequence brute force, math, matrices	2700	x180
86D	Powerful array data structures, implementation, math, two pointers	2200	x12981
86C	Genetic engineering dp, string suffix structures, trees	2500	x688
86B	Tetris revisited constructive algorithms, graph matchings, greedy, math	2200	x402
86A	Reflection math	1600	x1351
85E	Guard Towers binary search, dsu, geometry, graphs, sortings	2600	x936
85D	Sum of Medians binary search, brute force, data structures, implementation	2300	x1936
85C	Petya and Tree binary search, dfs and similar, probabilities, sortings, trees	2200	x523
85B	Embassy Queue data structures, greedy	1800	x962
84C	Biathlon binary search, implementation	1700	x1593
83E	Two Subsequences bitmasks, dp	2800	x463
83D	Numbers dp, math, number theory	2400	x835
83C	Track graphs, greedy, shortest paths	2400	x408
83B	Doctor binary search, math, sortings	1800	x1627
82E	Corridor geometry	2600	x217
82D	Two out of Three dp	2000	x1942
82C	General Mobilization data structures, dfs and similar, sortings	2000	x802
82B	Sets constructive algorithms, hashing, implementation	1700	x2019
81E	Pairs dfs and similar, dp, dsu, graphs, implementation, trees	2700	x330
81D	Polycarp's Picture Gallery constructive algorithms, greedy	2100	x640
81C	Average Score greedy, math, sortings	1700	x1640
81B	Sequence Formatting implementation, strings	1700	x1892
81A	Plug-in implementation	1400	x10360
79E	Security System math	2900	x122
79D	Password bitmasks, dp, shortest paths	2800	x964
79C	Beaver data structures, dp, greedy, hashing, strings, two pointers	1800	x1740
79B	Colorful Field implementation, sortings	1400	x6919
78E	Evacuation flows, graphs, shortest paths	2300	x530
78D	Archer's Shot binary search, geometry, math, two pointers	2300	x304
78C	Beaver Game dp, games, number theory	2000	x1822
77E	Martian Food geometry	2800	x370
77D	Domino Carpet dp, implementation	2300	x316
77C	Beavermuncher-0xFF dfs and similar, dp, dsu, greedy, trees	2100	x981
77B	Falling Anvils math, probabilities	1800	x2558
77A	Heroes brute force, implementation	1400	x1751
76F	Tourist binary search, data structures, dp	2300	x613
76E	Points implementation, math	1700	x1680
76D	Plus and xor dp, greedy, math	1700	x2013
76C	Mutation bitmasks, dp, math	2700	x272
76B	Mice greedy, two pointers	2100	x545
76A	Gift dsu, graphs, sortings, trees	2200	x1492
75E	Ship's Shortest Path geometry, shortest paths	2400	x271
75D	Big Maximum Sum data structures, dp, greedy, implementation, math, trees	2000	x1755
75C	Modified GCD binary search, number theory	1600	x12220
75B	Facetook Priority Wall expression parsing, implementation, strings	1500	x3242
74E	Shift It! constructive algorithms	2800	x148
74D	Hanger data structures	2400	x365
74C	Chessboard Billiard dfs and similar, dsu, graphs, number theory	2100	x1051
74B	Train dp, games, greedy	1500	x1502
73F	Plane of Tanks brute force, geometry	2900	x77
73E	Morrowindows math, number theory	2400	x324
73D	FreeDiv dfs and similar, graphs, greedy	2200	x619
73C	LionAge II dp	1800	x2075
73B	Need For Brake binary search, greedy, sortings	2000	x492
73A	The Elder Trolls IV: Oblivon greedy, math	1600	x1308
72I	Goofy Numbers *special problem, implementation	1500	x457
72H	Reverse It! *special problem, implementation	1600	x261
72F	Oil *special problem, greedy, math	1900	x117
72E	Ali goes shopping *special problem, brute force, strings	1800	x151
72D	Perse-script *special problem, expression parsing	2300	x73
72B	INI-file *special problem, implementation	2200	x76
72A	Goshtasp, Vishtasp and Eidi *special problem, greedy, math	1800	x183
71E	Nuclear Fusion bitmasks, dp	2200	x688
71D	Solitaire brute force, implementation	2200	x610
71C	Round Table Knights dp, math, number theory	1600	x6293
70E	Information Reform dp, implementation, trees	2700	x481
70D	Professor's task data structures, geometry	2700	x967
70C	Lucky Tickets binary search, data structures, sortings, two pointers	2200	x562
70B	Text Messaging expression parsing, greedy, strings	1600	x1728
69E	Subsegments data structures, implementation	1800	x4054
69D	Dot dp, games	1900	x944
69C	Game implementation	2000	x572
68E	Contact geometry	2900	x71
68D	Half-decay tree data structures, divide and conquer, dp, math, probabilities	2500	x452
68C	Synchrophasotron brute force	2200	x305
68B	Energy exchange binary search	1600	x4204
67E	Save the City! geometry	2500	x313
67D	Optical Experiment binary search, data structures, dp	1900	x1347
67C	Sequence of Balls dp	2600	x633
67B	Restoration of the Permutation greedy	1800	x757
67A	Partial Teacher dp, graphs, greedy, implementation	1800	x2074
66E	Petya and Post data structures, dp	2000	x687
66D	Petya and His Friends constructive algorithms, math, number theory	1700	x3083
66C	Petya and File System data structures, implementation	1800	x1002
65E	Harry Potter and Moving Staircases dfs and similar, implementation	2900	x89
65D	Harry Potter and the Sorting Hat brute force, dfs and similar, hashing	2200	x421
65C	Harry Potter and the Golden Snitch binary search, geometry	2100	x773
65B	Harry Potter and the History of Magic brute force, greedy, implementation	1700	x1323
65A	Harry Potter and Three Spells implementation, math	1800	x1789
64I	Sort the Table *special problem, sortings	2400	x86
64H	Table Bowling *special problem, sortings	2300	x111