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Problem set. Volume 6
Solved problems:
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Volume 5
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ID
Title
Source
Authors
Difficulty
1585
Penguins
NEERC 2007 Eastern Subregional
11545
38
1567
SMS-spam
USU Championship 2007
10956
40
1581
Teamwork
Autumn School Contest 2007
10944
40
1545
Hieroglyphs
Ural Championship 2007
9119
50
1563
Bayan
USU Championship 2007
8217
54
1502
Domino Dots
NEERC 2006 Eastern Subregional
6444
73
1510
Order
NEERC 2006 Eastern Subregional
5451
87
1573
Alchemy
Autumn School Contest 2007
4128
106
1582
Bookmakers
NEERC 2007 Eastern Subregional
3633
120
1521
War Games 2
Timus Top Coders: Third Challenge
3514
133
1506
Columns of Numbers
NEERC 2006 Eastern Subregional
3340
141
1572
Yekaterinozavodsk Great Well
Autumn School Contest 2007
3038
144
1586
Threeprime Numbers
NEERC 2007 Eastern Subregional
3029
144
1576
Telephone Tariffs
Autumn School Contest 2007
3021
145
1590
Bacon’s Cipher
NEERC 2007 Eastern Subregional
2294
190
1515
Cashmaster
Timus Top Coders: Third Challenge
2194
212
1517
Freedom of Choice
Timus Top Coders: Third Challenge
1856
251
1501
Sense of Beauty
NEERC 2006 Eastern Subregional
1776
265
1528
Sequence
Petrozavodsk Winter 2007. D.Gozman Contest
1717
267
1551
Sumo Tournament
Ural Championship 2007
1667
272
1537
Ents
USU Personal Contest 2007
1625
282
1523
K-inversions
Petrozavodsk Winter 2007. D.Gozman Contest
1548
297
1553
Caves and Tunnels
Petrozavodsk Summer 2007. NSU Contest
1515
290
1588
Jamaica
NEERC 2007 Eastern Subregional
1352
322
1513
Lemon Tale
Timus Top Coders: Third Challenge
1232
377
1574
Mathematicians and brackets
Autumn School Contest 2007
1225
356
1525
Path
Petrozavodsk Winter 2007. D.Gozman Contest
1155
397
1562
GM-pineapple
USU Championship 2007
1082
403
1507
Difficult Decision
NEERC 2006 Eastern Subregional
1062
441
1519
Formula 1
Timus Top Coders: Third Challenge
1013
458
1571
Interpreters
USU Championship 2007
973
448
1577
E-mail
Autumn School Contest 2007
923
471
1535
The Hobbit or There and Back Again
USU Personal Contest 2007
914
499
1579
Coat Transportation
Autumn School Contest 2007
884
492
1534
Football in Gondor
USU Personal Contest 2007
786
579
1550
Dean's Pyramid 3
Ural Championship 2007
761
591
1500
Pass Licenses
NEERC 2006 Eastern Subregional
737
633
1592
Chinese Watches
NEERC 2007 Eastern Subregional
720
600
1542
Autocompletion
Ural Championship 2007
705
638
1554
Multiplicative Functions
Petrozavodsk Summer 2007. NSU Contest
687
633
1564
Counting Ones
USU Championship 2007
632
686
1512
Zinium
Timus Top Coders: Third Challenge
533
862
1587
Flying Pig
NEERC 2007 Eastern Subregional
533
807
1593
Square Country. Version 2
528
737
1547
Password Search
Ural Championship 2007
521
859
1530
Ones and Zeroes
Petrozavodsk Winter 2007. D.Gozman Contest
508
892
1546
Japanese Sorting
Ural Championship 2007
506
884
1558
Periodical Numbers
Petrozavodsk Summer 2007. NSU Contest
505
857
1575
Yekaterinburg Subway 2
Autumn School Contest 2007
499
864
1578
Mammoth Hunt
Autumn School Contest 2007
494
872
1580
Dean's Debts
Autumn School Contest 2007
489
881
1570
Eating High
USU Championship 2007
477
904
1560
Elementary Symmetric Functions
Petrozavodsk Summer 2007. NSU Contest
464
931
1569
Networking the “Iset”
USU Championship 2007
454
949
1533
Fat Hobbits
USU Personal Contest 2007
440
1024
1518
Jedi Riddle 3
Timus Top Coders: Third Challenge
434
1054
1539
Intelligence Data
USU Personal Contest 2007
421
1069
1540
Battle for the Ring
USU Personal Contest 2007
413
1089
1591
Abstract Thinking
NEERC 2007 Eastern Subregional
405
1056
1527
Bad Roads
Petrozavodsk Winter 2007. D.Gozman Contest
387
1164
1511
Fiscal Operations
Timus Top Coders: Third Challenge
378
1207
1552
Brainfuck
Petrozavodsk Summer 2007. NSU Contest
362
1187
1544
Classmates 3
Ural Championship 2007
358
1239
1538
Towers of Guard
USU Personal Contest 2007
350
1280
1526
Martian Plates
Petrozavodsk Winter 2007. D.Gozman Contest
330
1359
1595
Perfect Sequence
322
1165
1584
Pharaohs’ Secrets
NEERC 2007 Eastern Subregional
315
1349
1531
Zones on a Plane
Petrozavodsk Winter 2007. D.Gozman Contest
314
1426
1508
Japanese Puzzle
NEERC 2006 Eastern Subregional
277
1648
1503
Polynomial
NEERC 2006 Eastern Subregional
260
1752
1568
Train Car Sorting
USU Championship 2007
258
1643
1516
Nostalgia
Timus Top Coders: Third Challenge
251
1794
1522
Factory
Petrozavodsk Winter 2007. D.Gozman Contest
250
1777
1514
National Park
Timus Top Coders: Third Challenge
248
1815
1557
Network Attack
Petrozavodsk Summer 2007. NSU Contest
236
1795
1565
The Duel for Three
USU Championship 2007
235
1797
1583
Cheese
NEERC 2007 Eastern Subregional
223
1881
1532
Lost in Translation
USU Personal Contest 2007
218
2021
1504
Good Manners
NEERC 2006 Eastern Subregional
202
2231
1541
Chase
USU Personal Contest 2007
202
2173
1543
Dance Revolution
Ural Championship 2007
198
2192
1549
Another Japanese Puzzle
Ural Championship 2007
184
2351
1520
Empire Strikes Back
Timus Top Coders: Third Challenge
180
2464
1505
Oil Transfer
NEERC 2006 Eastern Subregional
153
2902
1561
Winnie the Pooh
Petrozavodsk Summer 2007. NSU Contest
143
2886
1566
Triangular Postcards
USU Championship 2007
132
3100
1509
Domino Recognition
NEERC 2006 Eastern Subregional
125
3504
1529
Game of Squares
Petrozavodsk Winter 2007. D.Gozman Contest
114
3725
1597
Chernobyl’ Eagle on a Roof. Version 2
108
2054
1599
Winding Number
102
1923
1559
TruCoders Linguistics
Petrozavodsk Summer 2007. NSU Contest
92
4328
1594
Aztec Treasure
71
4776
1536
Delights of Pipe-weed
USU Personal Contest 2007
53
7313
1598
DSA Attack
43
4540
1556
Multishot in the Secret Cow Level
Petrozavodsk Summer 2007. NSU Contest
37
9394
1555
Find the Treasure!
Petrozavodsk Summer 2007. NSU Contest
36
9598
1524
Men in Black
Petrozavodsk Winter 2007. D.Gozman Contest
25
13198
1596
Knight Mare
23
9283
1548
Sakura and Statistics
Ural Championship 2007
20
15200
1589
Sokoban
NEERC 2007 Eastern Subregional
15
17530
Solved problems:
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