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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
14631
16
1225
Flags
NEERC 2002 Central Subregional
13972
35
1585
Penguins
NEERC 2007 Eastern Subregional
11542
38
1910
Titan Ruins: Hidden Entrance
NEERC 2012 Eastern Subregional
8789
33
1224
Spiral
NEERC 2002 Central Subregional
7503
66
1654
Cipher Message
NEERC 2008 Eastern Subregional
6927
58
1502
Domino Dots
NEERC 2006 Eastern Subregional
6444
73
2023
Donald is a postman
NEERC 2014 Eastern Subregional
6402
37
1139
City Blocks
NEERC 2001 Central Subregional
6345
77
1991
The battle near the swamp
NEERC 2013 Eastern Subregional
5770
45
1893
A380
NEERC 2011 Eastern Subregional
5514
57
1510
Order
NEERC 2006 Eastern Subregional
5449
87
1161
Stripies
NEERC 2001 Northern Subregional
5380
91
1136
Parliament
NEERC 2001 Central Subregional
4938
99
1228
Array
NEERC 2002 Central Subregional
4632
107
1712
Cipher Grille
NEERC 2009 Eastern Subregional
4520
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
414
1280
Topological Sorting
NEERC 2003 Central Subregional
3536
142
1506
Columns of Numbers
NEERC 2006 Eastern Subregional
3340
141
1160
Network
NEERC 2001 Northern Subregional
3203
155
1135
Recruits
NEERC 2001 Central Subregional
3032
161
1586
Threeprime Numbers
NEERC 2007 Eastern Subregional
3028
144
1711
Code Names
NEERC 2009 Eastern Subregional
2879
130
1056
Centers of the Net
NEERC 2000 Central Subregional
2698
545
1134
Cards
NEERC 2001 Central Subregional
2512
194
1138
Integer Percentage
NEERC 2001 Central Subregional
2433
200
1164
Fillword
NEERC 2001 Northern Subregional
2403
203
2018
The Debut Album
NEERC 2014 Eastern Subregional
2348
101
1054
Tower of Hanoi
NEERC 2000 Central Subregional
2307
637
1590
Bacon’s Cipher
NEERC 2007 Eastern Subregional
2293
190
1059
Expression
NEERC 2000 Central Subregional
2213
664
1133
Fibonacci Sequence
NEERC 2001 Central Subregional
2194
222
1162
Currency Exchange
NEERC 2001 Northern Subregional
2182
224
1057
Amount of Degrees
NEERC 2000 Central Subregional
2075
707
1650
Billionaires
NEERC 2008 Eastern Subregional
2048
197
1658
Sum of Digits
NEERC 2008 Eastern Subregional
2037
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
1776
265
1806
Mobile Telegraphs
NEERC 2010 Eastern Subregional
1649
208
1227
Rally Championship
NEERC 2002 Central Subregional
1648
299
1885
Passenger Comfort
NEERC 2011 Eastern Subregional
1599
196
2020
Traffic Jam in Flower Town
NEERC 2014 Eastern Subregional
1594
149
1137
Bus Routes
NEERC 2001 Central Subregional
1493
326
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
1294
375
1917
Titan Ruins: Deadly Accuracy
NEERC 2012 Eastern Subregional
1271
226
1718
Rejudge
NEERC 2009 Eastern Subregional
1243
300
1279
Warehouse
NEERC 2003 Central Subregional
1183
421
1651
Shortest Subchain
NEERC 2008 Eastern Subregional
1165
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
503
2019
Pair: normal and paranormal
NEERC 2014 Eastern Subregional
867
272
1804
The Machinegunners in a Playoff
NEERC 2010 Eastern Subregional
865
394
2015
Zhenya moves from the dormitory
NEERC 2014 Eastern Subregional
822
287
1500
Pass Licenses
NEERC 2006 Eastern Subregional
737
633
1998
The old Padawan
NEERC 2013 Eastern Subregional
737
352
1592
Chinese Watches
NEERC 2007 Eastern Subregional
720
600
1274
Fractional Arithmetic
NEERC 2003 Central Subregional
711
697
1888
Pilot Work Experience
NEERC 2011 Eastern Subregional
697
447
1992
CVS
NEERC 2013 Eastern Subregional
695
373
1890
Money out of Thin Air
NEERC 2011 Eastern Subregional
694
449
1276
Train
NEERC 2003 Central Subregional
674
735
1721
Two Sides of the Same Coin
NEERC 2009 Eastern Subregional
649
570
1230
Introspective Program
NEERC 2002 Central Subregional
645
757
1159
Fence
NEERC 2001 Northern Subregional
644
750
1277
Cops and Thieves
NEERC 2003 Central Subregional
625
791
1659
Regular Triangles
NEERC 2008 Eastern Subregional
622
641
1713
Key Substrings
NEERC 2009 Eastern Subregional
597
619
1809
Chapaev and Potatoes
NEERC 2010 Eastern Subregional
584
580
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
918
1058
Chocolate
NEERC 2000 Central Subregional
518
2787
1278
“… Connecting People”
NEERC 2003 Central Subregional
501
983
1997
Those are not the droids you're looking for
NEERC 2013 Eastern Subregional
486
530
1716
Alternative Solution
NEERC 2009 Eastern Subregional
485
759
1803
The Czechs' Rifles
NEERC 2010 Eastern Subregional
466
724
1891
Language Ocean
NEERC 2011 Eastern Subregional
457
677
2014
Zhenya moves from parents
NEERC 2014 Eastern Subregional
446
523
1995
Illegal spices
NEERC 2013 Eastern Subregional
443
580
1591
Abstract Thinking
NEERC 2007 Eastern Subregional
405
1056
1920
Titan Ruins: the Infinite Power of Magic
NEERC 2012 Eastern Subregional
405
698
1720
Summit Online Judge
NEERC 2009 Eastern Subregional
375
976
1715
Another Ball Killer
NEERC 2009 Eastern Subregional
364
1004
1892
Morning in Koltsovo
NEERC 2011 Eastern Subregional
356
864
1281
River Basin
NEERC 2003 Central Subregional
348
1403
1805
Chapaev and a Cipher Grille
NEERC 2010 Eastern Subregional
344
973
1584
Pharaohs’ Secrets
NEERC 2007 Eastern Subregional
315
1348
1918
Titan Ruins: Artful Manipulations
NEERC 2012 Eastern Subregional
308
911
1887
Frequent Flyer Card
NEERC 2011 Eastern Subregional
291
1050
1508
Japanese Puzzle
NEERC 2006 Eastern Subregional
277
1648
1503
Polynomial
NEERC 2006 Eastern Subregional
260
1751
1657
Cube Snake
NEERC 2008 Eastern Subregional
259
1505
2013
Neither shaken nor stirred
NEERC 2014 Eastern Subregional
251
915
1990
Podracing
NEERC 2013 Eastern Subregional
248
1019
1994
The Emperor's plan
NEERC 2013 Eastern Subregional
246
1027
1719
Kill the Shaitan-Boss
NEERC 2009 Eastern Subregional
241
1497
1807
Cartridges for Maxim
NEERC 2010 Eastern Subregional
230
1435
1912
Titan Ruins: Passing through Walls
NEERC 2012 Eastern Subregional
227
1222
1583
Cheese
NEERC 2007 Eastern Subregional
223
1880
1231
Turing: One, Two, Three, …
NEERC 2002 Central Subregional
221
2148
1996
Cipher Message 3
NEERC 2013 Eastern Subregional
208
1206
1655
Somali Pirates
NEERC 2008 Eastern Subregional
206
1874
2074
Timus problems classifier
Qualification of Eastern Subregional 2015
206
951
1504
Good Manners
NEERC 2006 Eastern Subregional
202
2231
1232
Asteroid Landing
NEERC 2002 Central Subregional
201
2351
1275
Knights of the Round Table
NEERC 2003 Central Subregional
199
2404
1894
Non-Flying Weather
NEERC 2011 Eastern Subregional
199
1513
2017
Best of a bad lot
NEERC 2014 Eastern Subregional
174
1297
1808
Chapaev at the Planet Ocean
NEERC 2010 Eastern Subregional
171
1903
1717
Eligibility Rules
NEERC 2009 Eastern Subregional
163
2171
1802
Cube Puzzle
NEERC 2010 Eastern Subregional
156
2075
1505
Oil Transfer
NEERC 2006 Eastern Subregional
153
2901
1913
Titan Ruins: Alignment of Forces
NEERC 2012 Eastern Subregional
149
1821
1886
Trip 2
NEERC 2011 Eastern Subregional
144
2053
1652
Banking Crisis
NEERC 2008 Eastern Subregional
139
2717
1895
Steaks on Board
NEERC 2011 Eastern Subregional
139
2122
1919
Titan Ruins: Transformation of Cylinders
NEERC 2012 Eastern Subregional
134
2011
1166
Funny Card Game
NEERC 2001 Northern Subregional
132
3535
1509
Domino Recognition
NEERC 2006 Eastern Subregional
125
3503
1714
Mnemonics and Palindromes 2
NEERC 2009 Eastern Subregional
109
3157
1163
Chapaev
NEERC 2001 Northern Subregional
103
4338
1916
Titan Ruins: Waiting for Stability
NEERC 2012 Eastern Subregional
79
3254
2075
Take care of your eyebrows!
Qualification of Eastern Subregional 2015
63
2815
1914
Titan Ruins: Serial Control
NEERC 2012 Eastern Subregional
56
4387
2022
Riding a Toad
NEERC 2014 Eastern Subregional
56
3616
1911
Titan Ruins: Overtaking Fire
NEERC 2012 Eastern Subregional
54
4525
1801
The Revolution Cup
NEERC 2010 Eastern Subregional
52
5555
1653
Death Conveyor
NEERC 2008 Eastern Subregional
50
6747
1649
Abstractionism to the People
NEERC 2008 Eastern Subregional
48
6980
1999
The secret module
NEERC 2013 Eastern Subregional
28
6919
2016
Magic and Science
NEERC 2014 Eastern Subregional
18
8524
2077
Reductions
Qualification of Eastern Subregional 2015
17
7611
2076
Vasiana
Qualification of Eastern Subregional 2015
16
7904
1589
Sokoban
NEERC 2007 Eastern Subregional
15
17526
Solved problems:
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