Problemset - Codeforces

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XIX Open Olympiad in Informatics - Final Stage, Day 1 (Unrated, Online Mirror, IOI rules)
3 days

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Problems

#	Name
295C	Greg and Friends combinatorics, dp, graphs, shortest paths	2100	x1782
295B	Greg and Graph dp, graphs, shortest paths	1700	x15016
295A	Greg and Array data structures, implementation	1400	x19405
294E	Shaass the Great dp, trees	2300	x990
294D	Shaass and Painter Robot brute force, implementation, number theory	2500	x366
294C	Shaass and Lights combinatorics, number theory	1900	x3932
294B	Shaass and Bookshelf dp, greedy	1700	x4620
294A	Shaass and Oskols implementation, math	800	x24622
293E	Close Vertices data structures, divide and conquer, trees	2700	x1529
293D	Ksusha and Square geometry, math, probabilities, two pointers	2700	x241
293C	Cube Problem brute force, math, number theory	2400	x584
293B	Distinct Paths brute force, combinatorics	2700	x888
293A	Weird Game games, greedy	1500	x2954
292E	Copying Data data structures	1900	x4313
292D	Connected Components data structures, dfs and similar, dp, dsu	1900	x2475
292C	Beautiful IP Addresses brute force	2000	x1176
292B	Network Topology graphs, implementation	1200	x8869
292A	SMSC implementation	1100	x2732
291E	Tree-String Problem *special problem, dfs and similar, hashing, strings	2000	x1384
291D	Parallel Programming *special problem, greedy	1600	x1486
291C	Network Mask *special problem, bitmasks, brute force, implementation	1600	x1712
291B	Command Line Arguments *special problem, implementation, strings	1300	x3039
291A	Spyke Talks *special problem, implementation, sortings	800	x6193
290F	Greedy Petya *special problem, dfs and similar, graphs, greedy	2800	x135
290E	HQ *special problem, constructive algorithms	2500	x207
290D	Orange *special problem, implementation	1400	x1820
290C	WTF? *special problem, graph matchings, implementation, trees	1700	x1557
290B	QR code *special problem, implementation	1500	x2459
290A	Mysterious strings *special problem, implementation	1400	x3024
289B	Polo the Penguin and Matrix brute force, dp, implementation, sortings, ternary search	1400	x17810
289A	Polo the Penguin and Segments brute force, implementation	1100	x9589
288E	Polo the Penguin and Lucky Numbers dp, implementation, math	2800	x301
288D	Polo the Penguin and Trees combinatorics, dfs and similar, trees	2400	x763
288C	Polo the Penguin and XOR operation implementation, math	1700	x2355
288B	Polo the Penguin and Houses combinatorics	1500	x2976
288A	Polo the Penguin and Strings greedy	1300	x6539
287B	Pipeline binary search, math	1700	x10306
287A	IQ Test brute force, implementation	1100	x20522
286E	Ladies' Shop constructive algorithms, fft, math	2800	x842
286D	Tourists data structures, sortings	2600	x380
286C	Main Sequence greedy, implementation	2100	x1542
286B	Shifting implementation	2200	x1128
286A	Lucky Permutation constructive algorithms, math	1400	x3213
285E	Positions in Permutations combinatorics, dp, math	2600	x1032
285D	Permutation Sum bitmasks, combinatorics, dp, implementation, meet-in-the-middle	1900	x1574
285C	Building Permutation greedy, implementation, sortings	1200	x23765
285B	Find Marble implementation	1200	x15220
285A	Slightly Decreasing Permutations greedy, implementation	1100	x13577
284B	Cows and Poker Game brute force, implementation	1000	x6990
284A	Cows and Primitive Roots implementation, math, number theory	1400	x6704
283E	Cow Tennis Tournament combinatorics, data structures, math	2800	x784
283D	Cows and Cool Sequences dp, math, number theory	2400	x555
283C	Coin Troubles dp	2100	x1477
283B	Cow Program dfs and similar, dp, graphs	1700	x3701
283A	Cows and Sequence constructive algorithms, data structures, implementation	1600	x6630
282E	Sausage Maximization bitmasks, data structures, trees	2200	x3738
282D	Yet Another Number Game dp, games	2100	x1472
282C	XOR and OR constructive algorithms, implementation, math	1500	x9573
282B	Painting Eggs greedy, math	1500	x13242
282A	Bit++ implementation	800	x286692
281B	Nearest Fraction brute force, implementation, two pointers	1700	x3061
281A	Word Capitalization implementation, strings	800	x227341
280E	Sequence Transformation brute force, data structures, dp, implementation, math	3000	x216
280D	k-Maximum Subsequence Sum data structures, flows, graphs, implementation	2800	x1393
280C	Game on Tree implementation, math, probabilities, trees	2200	x4275
280B	Maximum Xor Secondary data structures, implementation, two pointers	1800	x4814
280A	Rectangle Puzzle geometry	2000	x1479
279E	Beautiful Decomposition dp, games, greedy, number theory	1900	x1466
279D	The Minimum Number of Variables bitmasks, dp	2200	x790
279C	Ladder dp, implementation, two pointers	1700	x8400
279B	Books binary search, brute force, implementation, two pointers	1400	x57217
279A	Point on Spiral brute force, geometry, implementation	1400	x5656
278B	New Problem brute force, strings	1500	x3507
278A	Circle Line implementation	800	x12049
277E	Binary Tree on Plane flows, trees	2400	x1350
277D	Google Code Jam dp, probabilities	2800	x342
277C	Game games, implementation	2400	x458
277B	Set of Points constructive algorithms, geometry	2300	x819
277A	Learning Languages dfs and similar, dsu	1400	x19537
276E	Little Girl and Problem on Trees data structures, graphs, trees	2100	x1672
276D	Little Girl and Maximum XOR bitmasks, dp, greedy, implementation, math	1700	x14353
276C	Little Girl and Maximum Sum data structures, greedy, implementation, sortings	1500	x29611
276B	Little Girl and Game games, greedy	1300	x29504
276A	Lunch Rush implementation	900	x28271
275B	Convex Shape constructive algorithms, implementation	1700	x2851
275A	Lights Out implementation	900	x31500
274E	Mirror Room data structures, implementation	3000	x319
274D	Lovely Matrix dfs and similar, graphs, greedy, sortings	2200	x1054
274C	The Last Hole! brute force, geometry	2600	x351
274B	Zero Tree dfs and similar, dp, greedy, trees	1800	x5120
274A	k-Multiple Free Set binary search, greedy, sortings	1500	x10325
273E	Dima and Game dp, games	2600	x370
273D	Dima and Figure dp	2400	x428
272E	Dima and Horses combinatorics, constructive algorithms, graphs	2200	x1234
272D	Dima and Two Sequences combinatorics, math, sortings	1600	x2649
272C	Dima and Staircase data structures, implementation	1500	x6867
272B	Dima and Sequence implementation, math	1400	x4079
272A	Dima and Friends implementation, math	1000	x25429
271E	Three Horses constructive algorithms, math, number theory	2200	x521
271D	Good Substrings data structures, strings	1800	x11942