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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
14616
16
1225
Flags
NEERC 2002 Central Subregional
13966
35
1585
Penguins
NEERC 2007 Eastern Subregional
11539
38
1910
Titan Ruins: Hidden Entrance
NEERC 2012 Eastern Subregional
8784
33
1224
Spiral
NEERC 2002 Central Subregional
7499
66
1654
Cipher Message
NEERC 2008 Eastern Subregional
6924
58
1502
Domino Dots
NEERC 2006 Eastern Subregional
6442
73
2023
Donald is a postman
NEERC 2014 Eastern Subregional
6392
37
1139
City Blocks
NEERC 2001 Central Subregional
6344
77
1991
The battle near the swamp
NEERC 2013 Eastern Subregional
5763
45
1893
A380
NEERC 2011 Eastern Subregional
5510
57
1510
Order
NEERC 2006 Eastern Subregional
5446
87
1161
Stripies
NEERC 2001 Northern Subregional
5377
91
1136
Parliament
NEERC 2001 Central Subregional
4936
99
1228
Array
NEERC 2002 Central Subregional
4632
107
1712
Cipher Grille
NEERC 2009 Eastern Subregional
4518
83
1053
Pinocchio
NEERC 2000 Central Subregional
4397
335
1226
esreveR redrO
NEERC 2002 Central Subregional
4393
113
1582
Bookmakers
NEERC 2007 Eastern Subregional
3631
120
1055
Combinations
NEERC 2000 Central Subregional
3556
413
1280
Topological Sorting
NEERC 2003 Central Subregional
3536
142
1506
Columns of Numbers
NEERC 2006 Eastern Subregional
3340
141
1135
Recruits
NEERC 2001 Central Subregional
3032
161
1586
Threeprime Numbers
NEERC 2007 Eastern Subregional
3029
144
1160
Network
NEERC 2001 Northern Subregional
3021
164
1711
Code Names
NEERC 2009 Eastern Subregional
2880
130
1056
Centers of the Net
NEERC 2000 Central Subregional
2695
545
1134
Cards
NEERC 2001 Central Subregional
2513
194
1138
Integer Percentage
NEERC 2001 Central Subregional
2434
200
1164
Fillword
NEERC 2001 Northern Subregional
2404
203
2018
The Debut Album
NEERC 2014 Eastern Subregional
2345
101
1590
Bacon’s Cipher
NEERC 2007 Eastern Subregional
2293
190
1054
Tower of Hanoi
NEERC 2000 Central Subregional
2287
642
1059
Expression
NEERC 2000 Central Subregional
2212
664
1133
Fibonacci Sequence
NEERC 2001 Central Subregional
2195
222
1162
Currency Exchange
NEERC 2001 Northern Subregional
2135
228
1057
Amount of Degrees
NEERC 2000 Central Subregional
2056
714
1658
Sum of Digits
NEERC 2008 Eastern Subregional
2038
198
1650
Billionaires
NEERC 2008 Eastern Subregional
2033
198
1800
Murphy's Law
NEERC 2010 Eastern Subregional
2030
169
1656
Far Away Kingdom's Army
NEERC 2008 Eastern Subregional
1997
202
1501
Sense of Beauty
NEERC 2006 Eastern Subregional
1777
264
1227
Rally Championship
NEERC 2002 Central Subregional
1649
299
1885
Passenger Comfort
NEERC 2011 Eastern Subregional
1599
196
2020
Traffic Jam in Flower Town
NEERC 2014 Eastern Subregional
1594
149
1806
Mobile Telegraphs
NEERC 2010 Eastern Subregional
1561
219
1137
Bus Routes
NEERC 2001 Central Subregional
1492
326
1282
Game Tree
NEERC 2003 Central Subregional
1486
336
1915
Titan Ruins: Reconstruction of Bygones
NEERC 2012 Eastern Subregional
1371
209
1993
This cheeseburger you don't need
NEERC 2013 Eastern Subregional
1353
193
1588
Jamaica
NEERC 2007 Eastern Subregional
1352
322
1229
Strong Brickwork
NEERC 2002 Central Subregional
1299
379
1140
Swamp Incident
NEERC 2001 Central Subregional
1295
375
1917
Titan Ruins: Deadly Accuracy
NEERC 2012 Eastern Subregional
1271
226
1718
Rejudge
NEERC 2009 Eastern Subregional
1244
299
1279
Warehouse
NEERC 2003 Central Subregional
1184
421
1651
Shortest Subchain
NEERC 2008 Eastern Subregional
1165
344
1889
Airport Announcements
NEERC 2011 Eastern Subregional
1073
292
1507
Difficult Decision
NEERC 2006 Eastern Subregional
1063
440
1158
Censored!
NEERC 2001 Northern Subregional
964
503
2019
Pair: normal and paranormal
NEERC 2014 Eastern Subregional
867
272
1804
The Machinegunners in a Playoff
NEERC 2010 Eastern Subregional
866
393
2015
Zhenya moves from the dormitory
NEERC 2014 Eastern Subregional
822
286
1998
The old Padawan
NEERC 2013 Eastern Subregional
738
351
1500
Pass Licenses
NEERC 2006 Eastern Subregional
736
634
1592
Chinese Watches
NEERC 2007 Eastern Subregional
721
599
1274
Fractional Arithmetic
NEERC 2003 Central Subregional
710
697
1888
Pilot Work Experience
NEERC 2011 Eastern Subregional
698
446
1992
CVS
NEERC 2013 Eastern Subregional
696
372
1890
Money out of Thin Air
NEERC 2011 Eastern Subregional
695
448
1276
Train
NEERC 2003 Central Subregional
675
733
1721
Two Sides of the Same Coin
NEERC 2009 Eastern Subregional
650
569
1230
Introspective Program
NEERC 2002 Central Subregional
646
756
1159
Fence
NEERC 2001 Northern Subregional
645
748
1277
Cops and Thieves
NEERC 2003 Central Subregional
626
790
1659
Regular Triangles
NEERC 2008 Eastern Subregional
623
639
1713
Key Substrings
NEERC 2009 Eastern Subregional
597
618
1809
Chapaev and Potatoes
NEERC 2010 Eastern Subregional
585
578
2021
Scarily interesting!
NEERC 2014 Eastern Subregional
548
427
1587
Flying Pig
NEERC 2007 Eastern Subregional
534
805
1165
Subnumber
NEERC 2001 Northern Subregional
525
916
1058
Chocolate
NEERC 2000 Central Subregional
518
2786
1278
“… Connecting People”
NEERC 2003 Central Subregional
502
981
1997
Those are not the droids you're looking for
NEERC 2013 Eastern Subregional
487
528
1716
Alternative Solution
NEERC 2009 Eastern Subregional
485
758
1803
The Czechs' Rifles
NEERC 2010 Eastern Subregional
467
721
1891
Language Ocean
NEERC 2011 Eastern Subregional
458
675
2014
Zhenya moves from parents
NEERC 2014 Eastern Subregional
446
523
1995
Illegal spices
NEERC 2013 Eastern Subregional
444
578
1591
Abstract Thinking
NEERC 2007 Eastern Subregional
406
1053
1920
Titan Ruins: the Infinite Power of Magic
NEERC 2012 Eastern Subregional
406
695
1720
Summit Online Judge
NEERC 2009 Eastern Subregional
375
975
1715
Another Ball Killer
NEERC 2009 Eastern Subregional
365
1001
1892
Morning in Koltsovo
NEERC 2011 Eastern Subregional
357
861
1281
River Basin
NEERC 2003 Central Subregional
349
1399
1805
Chapaev and a Cipher Grille
NEERC 2010 Eastern Subregional
344
972
1584
Pharaohs’ Secrets
NEERC 2007 Eastern Subregional
316
1343
1918
Titan Ruins: Artful Manipulations
NEERC 2012 Eastern Subregional
309
907
1887
Frequent Flyer Card
NEERC 2011 Eastern Subregional
292
1046
1508
Japanese Puzzle
NEERC 2006 Eastern Subregional
278
1641
1503
Polynomial
NEERC 2006 Eastern Subregional
261
1744
1657
Cube Snake
NEERC 2008 Eastern Subregional
260
1498
2013
Neither shaken nor stirred
NEERC 2014 Eastern Subregional
252
910
1990
Podracing
NEERC 2013 Eastern Subregional
249
1014
1994
The Emperor's plan
NEERC 2013 Eastern Subregional
247
1022
1719
Kill the Shaitan-Boss
NEERC 2009 Eastern Subregional
242
1490
1807
Cartridges for Maxim
NEERC 2010 Eastern Subregional
231
1428
1912
Titan Ruins: Passing through Walls
NEERC 2012 Eastern Subregional
228
1215
1583
Cheese
NEERC 2007 Eastern Subregional
223
1879
1231
Turing: One, Two, Three, …
NEERC 2002 Central Subregional
222
2137
1996
Cipher Message 3
NEERC 2013 Eastern Subregional
209
1199
1655
Somali Pirates
NEERC 2008 Eastern Subregional
207
1864
2074
Timus problems classifier
Qualification of Eastern Subregional 2015
207
945
1504
Good Manners
NEERC 2006 Eastern Subregional
203
2219
1232
Asteroid Landing
NEERC 2002 Central Subregional
202
2339
1275
Knights of the Round Table
NEERC 2003 Central Subregional
200
2391
1894
Non-Flying Weather
NEERC 2011 Eastern Subregional
200
1504
2017
Best of a bad lot
NEERC 2014 Eastern Subregional
175
1288
1808
Chapaev at the Planet Ocean
NEERC 2010 Eastern Subregional
171
1901
1717
Eligibility Rules
NEERC 2009 Eastern Subregional
164
2157
1802
Cube Puzzle
NEERC 2010 Eastern Subregional
157
2061
1505
Oil Transfer
NEERC 2006 Eastern Subregional
153
2900
1913
Titan Ruins: Alignment of Forces
NEERC 2012 Eastern Subregional
150
1808
1886
Trip 2
NEERC 2011 Eastern Subregional
145
2038
1652
Banking Crisis
NEERC 2008 Eastern Subregional
140
2697
1895
Steaks on Board
NEERC 2011 Eastern Subregional
140
2106
1919
Titan Ruins: Transformation of Cylinders
NEERC 2012 Eastern Subregional
135
1995
1166
Funny Card Game
NEERC 2001 Northern Subregional
133
3509
1509
Domino Recognition
NEERC 2006 Eastern Subregional
126
3475
1714
Mnemonics and Palindromes 2
NEERC 2009 Eastern Subregional
110
3128
1163
Chapaev
NEERC 2001 Northern Subregional
104
4298
1916
Titan Ruins: Waiting for Stability
NEERC 2012 Eastern Subregional
80
3214
2075
Take care of your eyebrows!
Qualification of Eastern Subregional 2015
64
2772
1914
Titan Ruins: Serial Control
NEERC 2012 Eastern Subregional
57
4317
2022
Riding a Toad
NEERC 2014 Eastern Subregional
57
3557
1911
Titan Ruins: Overtaking Fire
NEERC 2012 Eastern Subregional
55
4450
1801
The Revolution Cup
NEERC 2010 Eastern Subregional
52
5550
1653
Death Conveyor
NEERC 2008 Eastern Subregional
51
6633
1649
Abstractionism to the People
NEERC 2008 Eastern Subregional
49
6858
1999
The secret module
NEERC 2013 Eastern Subregional
29
6734
2016
Magic and Science
NEERC 2014 Eastern Subregional
18
8512
2077
Reductions
Qualification of Eastern Subregional 2015
18
7327
2076
Vasiana
Qualification of Eastern Subregional 2015
16
7891
1589
Sokoban
NEERC 2007 Eastern Subregional
14
18246
Solved problems:
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