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Problem set. Hardest Problems
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ID
Title
Source
Authors
Difficulty
1074
Very Short Problem
USU Personal Contest 2001
605
2058
1058
Chocolate
NEERC 2000 Central Subregional
474
2834
1177
Like Comparisons
USU Personal Contest 2002
355
1258
1171
Lost in Space
Romanian Online Contest December 2001
344
1294
1148
Building Towers
DSAP Vietnam Online Contest November 2001
252
1746
1216
Two Pawns and One King
USU Championship 2002
216
2053
1395
Pascal vs. C++. Version 2
167
2593
1312
Tray
Ural Championship 2004. Round 1
154
2887
1239
Ghost Busters
NEERC 2002
147
2960
1464
Light
Petrozavodsk Winter 2006. USU Contest
147
2850
1438
Time Limit Exceeded
USU Personal Contest 2006
146
2985
1166
Funny Card Game
NEERC 2001 Northern Subregional
121
3591
1695
Work for Robots
Petrozavodsk Winter 2009. USU Contest
115
2838
1199
Mouse
108
3666
1714
Mnemonics and Palindromes 2
NEERC 2009 Eastern Subregional
106
2896
1478
Spy Satellites
Petrozavodsk Summer 2006. Ural+Orel Contest
104
3885
1344
Gigantic Turnip
USU Championship 2004
97
4469
1460
Wires
Petrozavodsk Winter 2006. USU Contest
97
4182
1271
Sailing Directions
USU Championship 2003
92
4613
1384
Goat in the Garden 4
Petrozavodsk Summer 2005. Moscow+Ural Contest
83
5167
1391
Snake
Petrozavodsk Summer 2005. Moscow+Ural Contest
81
5281
1661
Dodecahedron
Petrozavodsk Winter 2008. USU Contest
77
4166
1618
Arrays Printing
Petrozavodsk Winter 2008. ITMO Contest
75
4401
1479
Scheduled Checking
Petrozavodsk Summer 2006. Ural+Orel Contest
73
5336
1621
Definite Integral
Petrozavodsk Winter 2008. ITMO Contest
69
4736
1662
Goat in the Garden 6
Petrozavodsk Winter 2008. USU Contest
68
4647
1594
Aztec Treasure
64
4700
1843
Cutting a Parallelepiped
Petrozavodsk Summer 2010. USU Contest
64
3730
1954
Five Palindromes
Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection
55
3479
1624
Go out of here!
Petrozavodsk Winter 2008. ITMO Contest
54
5845
1763
Expert Flea
Ural Championship 2010
53
5078
1536
Delights of Pipe-weed
USU Personal Contest 2007
52
6876
1674
Drunk King
Petrozavodsk Summer 2008. USU Contest
52
5815
1668
Death Star 2
Petrozavodsk Winter 2008. USU Contest
48
6250
1432
Twofold Luck
USU Personal Contest 2006
47
8169
1660
The Island of Bad Luck
Petrozavodsk Winter 2008. USU Contest
47
6359
1653
Death Conveyor
NEERC 2008 Eastern Subregional
45
6673
1649
Abstractionism to the People
NEERC 2008 Eastern Subregional
44
6797
1415
Mobile Life
USU Championship 2005
43
9033
1376
Dean's Pyramid 2
Ural Championship 2005. Round 1
40
9609
1390
Shots at Walls
Petrozavodsk Summer 2005. Moscow+Ural Contest
40
9611
1848
Fly Hunt
Petrozavodsk Summer 2010. USU Contest
40
5520
1626
Interfering Segment
Petrozavodsk Winter 2008. ITMO Contest
38
7794
1678
Space Poker 3
Petrozavodsk Summer 2008. USU Contest
37
7671
1819
Professional Approach
Petrozavodsk Summer 2010. Tavrida NU Contest
35
6556
1556
Multishot in the Secret Cow Level
Petrozavodsk Summer 2007. NSU Contest
34
9225
1842
Local Roots
Petrozavodsk Summer 2010. USU Contest
34
6273
1374
Misere
Ural Championship 2005. Round 1
32
11439
1399
Economical Director
30
10812
1853
Laser Technologies
Petrozavodsk Summer 2011. Ural SU Team.GOV Contest
29
7064
1906
The Lost Civilization
Ural Championship 2012
27
6620
1369
Cockroach Race
Ural Championship 2005. Round 2
26
13306
1383
Flower-garden Designs
Petrozavodsk Summer 2005. Moscow+Ural Contest
25
13730
1555
Find the Treasure!
Petrozavodsk Summer 2007. NSU Contest
25
11597
1524
Men in Black
Petrozavodsk Winter 2007. D.Gozman Contest
24
12577
1672
Droid flies
Petrozavodsk Summer 2008. USU Contest
23
10925
1693
Loyd's Problem
Petrozavodsk Winter 2009. USU Contest
23
10751
1840
Victim of Advertising
Ural Championship 2011
23
8713
1388
Photo
Petrozavodsk Summer 2005. Moscow+Ural Contest
19
16570
1596
Knight Mare
19
9038
1708
Sum of Digits 2
Ural Championship 2009
19
12166
2016
Magic and Science
NEERC 2014 Eastern Subregional
17
7047
2054
Astronomy
Ural Championship 2015
17
6503
1548
Sakura and Statistics
Ural Championship 2007
14
17555
2076
Vasiana
Qualification of Eastern Subregional 2015
13
6739
1394
Ships. Version 2
12
21843
2082
Poker
Ural Championship 2016
12
6695
1952
To Kill the Dragon
Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection
11
10766
1589
Sokoban
NEERC 2007 Eastern Subregional
9
21180
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