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Problem set. NEERC Regionals
Solved problems:
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ID
Title
Source
Authors
Difficulty
2012
About Grisha N.
NEERC 2014 Eastern Subregional
14654
16
1225
Flags
NEERC 2002 Central Subregional
13981
35
1585
Penguins
NEERC 2007 Eastern Subregional
11553
38
1910
Titan Ruins: Hidden Entrance
NEERC 2012 Eastern Subregional
8797
33
1224
Spiral
NEERC 2002 Central Subregional
7505
66
1654
Cipher Message
NEERC 2008 Eastern Subregional
6929
58
1502
Domino Dots
NEERC 2006 Eastern Subregional
6444
73
2023
Donald is a postman
NEERC 2014 Eastern Subregional
6412
37
1139
City Blocks
NEERC 2001 Central Subregional
6346
77
1991
The battle near the swamp
NEERC 2013 Eastern Subregional
5776
46
1893
A380
NEERC 2011 Eastern Subregional
5515
57
1510
Order
NEERC 2006 Eastern Subregional
5452
87
1161
Stripies
NEERC 2001 Northern Subregional
5381
91
1136
Parliament
NEERC 2001 Central Subregional
4940
99
1228
Array
NEERC 2002 Central Subregional
4633
107
1712
Cipher Grille
NEERC 2009 Eastern Subregional
4522
83
1053
Pinocchio
NEERC 2000 Central Subregional
4399
335
1226
esreveR redrO
NEERC 2002 Central Subregional
4393
113
1582
Bookmakers
NEERC 2007 Eastern Subregional
3633
120
1055
Combinations
NEERC 2000 Central Subregional
3557
414
1280
Topological Sorting
NEERC 2003 Central Subregional
3537
142
1506
Columns of Numbers
NEERC 2006 Eastern Subregional
3340
141
1160
Network
NEERC 2001 Northern Subregional
3241
153
1135
Recruits
NEERC 2001 Central Subregional
3033
161
1586
Threeprime Numbers
NEERC 2007 Eastern Subregional
3029
144
1711
Code Names
NEERC 2009 Eastern Subregional
2879
130
1056
Centers of the Net
NEERC 2000 Central Subregional
2700
545
1134
Cards
NEERC 2001 Central Subregional
2514
194
1138
Integer Percentage
NEERC 2001 Central Subregional
2433
201
1164
Fillword
NEERC 2001 Northern Subregional
2404
203
2018
The Debut Album
NEERC 2014 Eastern Subregional
2368
101
1162
Currency Exchange
NEERC 2001 Northern Subregional
2317
211
1054
Tower of Hanoi
NEERC 2000 Central Subregional
2310
636
1590
Bacon’s Cipher
NEERC 2007 Eastern Subregional
2298
190
1059
Expression
NEERC 2000 Central Subregional
2213
664
1133
Fibonacci Sequence
NEERC 2001 Central Subregional
2196
222
1057
Amount of Degrees
NEERC 2000 Central Subregional
2081
706
1650
Billionaires
NEERC 2008 Eastern Subregional
2078
194
1658
Sum of Digits
NEERC 2008 Eastern Subregional
2037
198
1800
Murphy's Law
NEERC 2010 Eastern Subregional
2031
169
1656
Far Away Kingdom's Army
NEERC 2008 Eastern Subregional
1997
202
1501
Sense of Beauty
NEERC 2006 Eastern Subregional
1776
265
1806
Mobile Telegraphs
NEERC 2010 Eastern Subregional
1696
202
1227
Rally Championship
NEERC 2002 Central Subregional
1649
299
1885
Passenger Comfort
NEERC 2011 Eastern Subregional
1600
197
2020
Traffic Jam in Flower Town
NEERC 2014 Eastern Subregional
1594
149
1137
Bus Routes
NEERC 2001 Central Subregional
1497
325
1282
Game Tree
NEERC 2003 Central Subregional
1486
336
1915
Titan Ruins: Reconstruction of Bygones
NEERC 2012 Eastern Subregional
1371
210
1588
Jamaica
NEERC 2007 Eastern Subregional
1352
322
1993
This cheeseburger you don't need
NEERC 2013 Eastern Subregional
1352
193
1229
Strong Brickwork
NEERC 2002 Central Subregional
1299
379
1140
Swamp Incident
NEERC 2001 Central Subregional
1297
375
1917
Titan Ruins: Deadly Accuracy
NEERC 2012 Eastern Subregional
1272
226
1718
Rejudge
NEERC 2009 Eastern Subregional
1244
300
1279
Warehouse
NEERC 2003 Central Subregional
1184
421
1651
Shortest Subchain
NEERC 2008 Eastern Subregional
1166
345
1889
Airport Announcements
NEERC 2011 Eastern Subregional
1073
292
1507
Difficult Decision
NEERC 2006 Eastern Subregional
1062
441
1158
Censored!
NEERC 2001 Northern Subregional
964
504
2019
Pair: normal and paranormal
NEERC 2014 Eastern Subregional
867
273
1804
The Machinegunners in a Playoff
NEERC 2010 Eastern Subregional
865
394
2015
Zhenya moves from the dormitory
NEERC 2014 Eastern Subregional
823
287
1500
Pass Licenses
NEERC 2006 Eastern Subregional
737
633
1998
The old Padawan
NEERC 2013 Eastern Subregional
737
353
1592
Chinese Watches
NEERC 2007 Eastern Subregional
721
600
1274
Fractional Arithmetic
NEERC 2003 Central Subregional
718
690
1888
Pilot Work Experience
NEERC 2011 Eastern Subregional
698
447
1992
CVS
NEERC 2013 Eastern Subregional
696
373
1890
Money out of Thin Air
NEERC 2011 Eastern Subregional
694
450
1276
Train
NEERC 2003 Central Subregional
676
733
1721
Two Sides of the Same Coin
NEERC 2009 Eastern Subregional
650
570
1230
Introspective Program
NEERC 2002 Central Subregional
647
756
1159
Fence
NEERC 2001 Northern Subregional
646
748
1277
Cops and Thieves
NEERC 2003 Central Subregional
625
792
1659
Regular Triangles
NEERC 2008 Eastern Subregional
622
641
1713
Key Substrings
NEERC 2009 Eastern Subregional
598
618
1809
Chapaev and Potatoes
NEERC 2010 Eastern Subregional
586
578
2021
Scarily interesting!
NEERC 2014 Eastern Subregional
547
429
1587
Flying Pig
NEERC 2007 Eastern Subregional
533
807
1165
Subnumber
NEERC 2001 Northern Subregional
524
919
1058
Chocolate
NEERC 2000 Central Subregional
518
2789
1278
“… Connecting People”
NEERC 2003 Central Subregional
501
984
1997
Those are not the droids you're looking for
NEERC 2013 Eastern Subregional
488
529
1716
Alternative Solution
NEERC 2009 Eastern Subregional
486
758
1803
The Czechs' Rifles
NEERC 2010 Eastern Subregional
466
724
1891
Language Ocean
NEERC 2011 Eastern Subregional
457
678
2014
Zhenya moves from parents
NEERC 2014 Eastern Subregional
446
524
1995
Illegal spices
NEERC 2013 Eastern Subregional
444
580
1920
Titan Ruins: the Infinite Power of Magic
NEERC 2012 Eastern Subregional
406
697
1591
Abstract Thinking
NEERC 2007 Eastern Subregional
405
1057
1720
Summit Online Judge
NEERC 2009 Eastern Subregional
375
977
1715
Another Ball Killer
NEERC 2009 Eastern Subregional
365
1003
1892
Morning in Koltsovo
NEERC 2011 Eastern Subregional
356
865
1281
River Basin
NEERC 2003 Central Subregional
348
1404
1805
Chapaev and a Cipher Grille
NEERC 2010 Eastern Subregional
344
974
1584
Pharaohs’ Secrets
NEERC 2007 Eastern Subregional
315
1349
1918
Titan Ruins: Artful Manipulations
NEERC 2012 Eastern Subregional
308
912
1887
Frequent Flyer Card
NEERC 2011 Eastern Subregional
291
1052
1508
Japanese Puzzle
NEERC 2006 Eastern Subregional
277
1649
1503
Polynomial
NEERC 2006 Eastern Subregional
260
1752
1657
Cube Snake
NEERC 2008 Eastern Subregional
259
1506
2013
Neither shaken nor stirred
NEERC 2014 Eastern Subregional
251
916
1990
Podracing
NEERC 2013 Eastern Subregional
248
1021
1994
The Emperor's plan
NEERC 2013 Eastern Subregional
246
1029
1719
Kill the Shaitan-Boss
NEERC 2009 Eastern Subregional
241
1498
1807
Cartridges for Maxim
NEERC 2010 Eastern Subregional
230
1436
1912
Titan Ruins: Passing through Walls
NEERC 2012 Eastern Subregional
227
1223
1583
Cheese
NEERC 2007 Eastern Subregional
223
1882
1231
Turing: One, Two, Three, …
NEERC 2002 Central Subregional
221
2149
1996
Cipher Message 3
NEERC 2013 Eastern Subregional
208
1208
2074
Timus problems classifier
Qualification of Eastern Subregional 2015
207
949
1655
Somali Pirates
NEERC 2008 Eastern Subregional
206
1876
1504
Good Manners
NEERC 2006 Eastern Subregional
202
2232
1232
Asteroid Landing
NEERC 2002 Central Subregional
201
2352
1275
Knights of the Round Table
NEERC 2003 Central Subregional
199
2405
1894
Non-Flying Weather
NEERC 2011 Eastern Subregional
199
1514
2017
Best of a bad lot
NEERC 2014 Eastern Subregional
175
1292
1808
Chapaev at the Planet Ocean
NEERC 2010 Eastern Subregional
171
1905
1717
Eligibility Rules
NEERC 2009 Eastern Subregional
163
2173
1802
Cube Puzzle
NEERC 2010 Eastern Subregional
156
2077
1505
Oil Transfer
NEERC 2006 Eastern Subregional
153
2903
1913
Titan Ruins: Alignment of Forces
NEERC 2012 Eastern Subregional
149
1824
1886
Trip 2
NEERC 2011 Eastern Subregional
144
2055
1652
Banking Crisis
NEERC 2008 Eastern Subregional
139
2719
1895
Steaks on Board
NEERC 2011 Eastern Subregional
139
2124
1919
Titan Ruins: Transformation of Cylinders
NEERC 2012 Eastern Subregional
134
2014
1166
Funny Card Game
NEERC 2001 Northern Subregional
132
3537
1509
Domino Recognition
NEERC 2006 Eastern Subregional
125
3505
1714
Mnemonics and Palindromes 2
NEERC 2009 Eastern Subregional
109
3159
1163
Chapaev
NEERC 2001 Northern Subregional
103
4340
1916
Titan Ruins: Waiting for Stability
NEERC 2012 Eastern Subregional
79
3258
2075
Take care of your eyebrows!
Qualification of Eastern Subregional 2015
64
2783
1914
Titan Ruins: Serial Control
NEERC 2012 Eastern Subregional
56
4393
2022
Riding a Toad
NEERC 2014 Eastern Subregional
56
3623
1911
Titan Ruins: Overtaking Fire
NEERC 2012 Eastern Subregional
54
4530
1801
The Revolution Cup
NEERC 2010 Eastern Subregional
52
5560
1653
Death Conveyor
NEERC 2008 Eastern Subregional
50
6753
1649
Abstractionism to the People
NEERC 2008 Eastern Subregional
48
6986
1999
The secret module
NEERC 2013 Eastern Subregional
28
6930
2016
Magic and Science
NEERC 2014 Eastern Subregional
18
8539
2077
Reductions
Qualification of Eastern Subregional 2015
17
7627
2076
Vasiana
Qualification of Eastern Subregional 2015
16
7920
1589
Sokoban
NEERC 2007 Eastern Subregional
15
17538
Solved problems:
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