Problemset - Codeforces

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IAEPC Preliminary Contest (Codeforces Round 999, Div. 1 + Div. 2)
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Problems

#	Name
68E	Contact geometry	2900	x72
68D	Half-decay tree data structures, divide and conquer, dp, math, probabilities	2500	x481
68C	Synchrophasotron brute force	2200	x312
68B	Energy exchange binary search	1600	x4772
67E	Save the City! geometry	2500	x318
67D	Optical Experiment binary search, data structures, dp	1900	x1506
67C	Sequence of Balls dp	2600	x690
67B	Restoration of the Permutation greedy	1800	x781
67A	Partial Teacher dp, graphs, greedy, implementation	1800	x2147
66E	Petya and Post data structures, dp	2000	x772
66D	Petya and His Friends constructive algorithms, math, number theory	1700	x3211
66C	Petya and File System data structures, implementation	1800	x1087
65E	Harry Potter and Moving Staircases dfs and similar, implementation	2900	x94
65D	Harry Potter and the Sorting Hat brute force, dfs and similar, hashing	2200	x436
65C	Harry Potter and the Golden Snitch binary search, geometry	2100	x806
65B	Harry Potter and the History of Magic brute force, greedy, implementation	1700	x1395
65A	Harry Potter and Three Spells implementation, math	1800	x1829
64I	Sort the Table *special problem, sortings	2400	x91
64H	Table Bowling *special problem, sortings	2300	x117
64G	Path Canonization *special problem	2200	x123
64F	Domain *special problem, expression parsing	2000	x184
64E	Prime Segment *special problem, brute force, math, number theory	1800	x250
64D	Presents *special problem, greedy	1800	x292
64C	Table *special problem, greedy, implementation, math	1600	x342
64B	Expression *special problem, expression parsing	1500	x1025
63E	Sweets Game bitmasks, dfs and similar, dp, games, implementation	2000	x775
63D	Dividing Island constructive algorithms	1900	x1276
63C	Bulls and Cows brute force, implementation	1700	x1756
62E	World Evil dp, flows	2700	x236
62D	Wormhouse dfs and similar, graphs	2300	x375
62C	Inquisition geometry, implementation, sortings	2300	x254
62B	Tyndex.Brome binary search, implementation	1800	x1298
61E	Enemy is weak data structures, trees	1900	x11693
61D	Eternal Victory dfs and similar, graphs, greedy, shortest paths, trees	1800	x6696
61C	Capture Valerian math	2000	x724
60E	Mushroom Gnomes math, matrices	2600	x328
60D	Savior brute force, dsu, math	2500	x462
60C	Mushroom Strife brute force, dfs and similar	2100	x573
60B	Serial Time! dfs and similar, dsu	1400	x4728
59E	Shortest Path graphs, shortest paths	2000	x3664
59D	Team Arrangement constructive algorithms, greedy, implementation	2000	x643
59C	Title expression parsing	1600	x2135
58E	Expression dp	2400	x408
58D	Calendar greedy, strings	2000	x740
58C	Trees brute force	1800	x2052
57E	Chess math, shortest paths	3000	x264
57D	Journey dp, math	2500	x345
57C	Array combinatorics, math	1900	x2790
57B	Martian Architecture implementation	1600	x1026
56E	Domino Principle binary search, data structures, sortings	2200	x2460
56D	Changing a String dp	2100	x1682
56C	Corporation Mail data structures, expression parsing, implementation	1700	x1176
55E	Very simple problem geometry, two pointers	2500	x714
55D	Beautiful numbers dp, number theory	2500	x3987
55C	Pie or die games	1900	x1669
55B	Smallest number brute force	1600	x2929
54E	Vacuum Сleaner geometry	2700	x194
54D	Writing a Song brute force, dp, strings	2100	x553
54C	First Digit Law dp, math, probabilities	2000	x1363
54B	Cutting Jigsaw Puzzle hashing, implementation	1800	x795
53E	Dead Ends bitmasks, dp	2500	x1025
53D	Physical Education sortings	1500	x2070
53B	Blog Photo binary search, implementation	1700	x1421
52C	Circular RMQ data structures	2200	x9328
52B	Right Triangles combinatorics	1600	x2100
51F	Caterpillar dfs and similar, dp, graphs, trees	2800	x655
51E	Pentagon combinatorics, graphs, matrices	2400	x413
51D	Geometrical problem implementation	2200	x483
51C	Three Base Stations binary search, greedy	1800	x2108
51B	bHTML Tables Analisys expression parsing	1700	x878
50E	Square Equation Roots math	2300	x368
50D	Bombing binary search, dp, probabilities	2100	x644
50C	Happy Farm 5 geometry	2000	x788
50B	Choosing Symbol Pairs strings	1500	x5767
49E	Common ancestor dp	2300	x682
49D	Game brute force, dp, implementation	1800	x1933
49C	Disposition constructive algorithms, math	1700	x1709
49B	Sum math	1500	x2510
48H	Black and White constructive algorithms	2800	x153
48G	Galaxy Union dp, trees, two pointers	2700	x277
48F	Snow sellers greedy, sortings	2800	x161
48E	Ivan the Fool VS Gorynych the Dragon dp, games, graphs	2100	x598
48D	Permutations greedy	1500	x2583
48C	The Race math	1800	x788
47E	Cannon data structures, geometry, sortings	2200	x376
47D	Safe brute force	2200	x790
47C	Crossword implementation	2000	x794
46G	Emperor's Problem geometry	2500	x120
46F	Hercule Poirot Problem dsu, graphs	2300	x335
46E	Comb data structures, dp	1900	x966
46D	Parking Lot data structures, implementation	1800	x996
46C	Hamsters and Tigers two pointers	1600	x2505
45J	Planting Trees constructive algorithms	1800	x956
45I	TCMCF+++ greedy	1400	x2515
45H	Road Problem graphs	2100	x197
45G	Prime Problem number theory	2200	x1059
45F	Goats and Wolves greedy	2500	x148
45E	Director constructive algorithms, greedy	2000	x555
45D	Event Dates greedy, meet-in-the-middle, sortings	1900	x1711
45C	Dancing Lessons data structures	1900	x934