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Problem set. Volume 4
Solved problems:
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Volume 3
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ID
Title
Source
Authors
Difficulty
1313
Some Words about Sport
Ural Championship 2004. Round 1
14852
34
1319
Hotel
Ural Championship 2004. Round 2
13021
39
1327
Fuses
Autumn School Contest 2004
10908
47
1349
Farm
Spring School Contest 2005
10098
50
1370
Magician
Ural Championship 2005. Round 2
5669
90
1330
Intervals
Autumn School Contest 2004
5269
96
1353
Milliard Vasya's Function
Spring School Contest 2005
4916
103
1336
Problem of Ben Betsalel
Autumn School Contest 2004
4181
121
1352
Mersenne Primes
Spring School Contest 2005
3913
130
1354
Palindrome. Again Palindrome
Spring School Contest 2005
3669
139
1306
Sequence Median
Ural Championship 1998
3490
144
1335
White Thesis
Autumn School Contest 2004
2816
180
1303
Minimal Coverage
Ural Championship 1998
2782
181
1348
Goat in the Garden 2
Spring School Contest 2005
2718
187
1322
Spy
Ural Championship 2004. Round 2
2680
188
1355
Bald Spot Revisited
Spring School Contest 2005
2408
211
1333
Genie Bomber 2
Autumn School Contest 2004
2337
216
1385
Interesting Number
Petrozavodsk Summer 2005. Moscow+Ural Contest
2087
244
1320
Graph Decomposition
Ural Championship 2004. Round 2
1744
288
1356
Something Easier
Spring School Contest 2005
1717
295
1377
Lara Croft
Ural Championship 2005. Round 1
1726
295
1346
Intervals of Monotonicity
USU Championship 2004
1711
296
1302
Delta-wave
Ural Championship 1998
1448
346
1350
Canteen
Spring School Contest 2005
1289
392
1326
Bottle Taps
Ural Championship 2004. Round 2
1269
395
1343
Fairy Tale
USU Championship 2004
1209
418
1316
Electronic Auction
Ural Championship 2004. Round 1
1144
438
1362
Classmates 2
Ural Championship 2005. Round 2
1134
446
1329
Galactic History
Autumn School Contest 2004
1087
463
1351
Good Gnusmas – Dead Gnusmas
Spring School Contest 2005
966
522
1366
Presents
Ural Championship 2005. Round 2
960
526
1371
Cargo Agency
Ural Championship 2005. Round 1
963
526
1325
Dirt
Ural Championship 2004. Round 2
929
538
1334
Checkers
Autumn School Contest 2004
934
538
1375
Bill Clevers
Ural Championship 2005. Round 1
935
541
1358
Cables
Spring School Contest 2005
930
542
1389
Roadworks
Petrozavodsk Summer 2005. Moscow+Ural Contest
905
559
1314
Chase in Subway
Ural Championship 2004. Round 1
845
591
1309
Dispute
Ural Championship 2004. Round 1
820
608
1332
Genie Bomber
Autumn School Contest 2004
806
622
1379
Cups Transportation
Ural Championship 2005. Round 1
802
630
1305
Convex Hull
Ural Championship 1998
710
701
1301
Cube in Labyrinth
Ural Championship 1998
671
741
1342
Enterprise
USU Championship 2004
672
747
1392
Dreaming of Stars
662
761
1323
Classmates
Ural Championship 2004. Round 2
604
823
1373
Pictura ex Machina
Ural Championship 2005. Round 1
597
843
1339
Babies
USU Championship 2004
580
864
1398
Bishop and Pawn
524
874
1324
Extra Spaces
Ural Championship 2004. Round 2
534
928
1364
LaraKiller
Ural Championship 2005. Round 2
522
959
1331
Vladislava
Autumn School Contest 2004
500
996
1317
Hail
Ural Championship 2004. Round 2
458
1079
1310
ACM Diagnostics
Ural Championship 2004. Round 1
453
1091
1341
Device
USU Championship 2004
441
1130
1359
Construction
Spring School Contest 2005
431
1156
1393
Average Common Prefix
427
1161
1386
Maze
Petrozavodsk Summer 2005. Moscow+Ural Contest
428
1168
1357
Teakettle 1.0 for Dummies
Spring School Contest 2005
417
1194
1360
Philosophical Dispute
Ural Championship 2005. Round 2
392
1269
1307
Archiver
Ural Championship 2004. Round 1
384
1282
1321
Floor Indicator
Ural Championship 2004. Round 2
366
1343
1347
Blog
Spring School Contest 2005
359
1382
1387
Vasya's Dad
Petrozavodsk Summer 2005. Moscow+Ural Contest
357
1394
1328
Fireball
Autumn School Contest 2004
352
1403
1318
Logarithm
Ural Championship 2004. Round 2
346
1419
1345
HTML
USU Championship 2004
345
1435
1311
Stable Construction
Ural Championship 2004. Round 1
337
1455
1378
Artificial Intelligence
Ural Championship 2005. Round 1
336
1479
1337
Bureaucracy
Autumn School Contest 2004
316
1558
1397
Points Game
271
1696
1382
Game with Cards
Petrozavodsk Summer 2005. Moscow+Ural Contest
282
1752
1338
Automobiles
USU Championship 2004
274
1794
1304
Parallelepiped
Ural Championship 1998
255
1905
1315
MDPAR and MIIAR
Ural Championship 2004. Round 1
255
1906
1361
Spaceology vs. Chronistics
Ural Championship 2005. Round 2
254
1933
1396
Maximum. Version 2
239
1968
1395
Pascal vs. C++. Version 2
200
2340
1368
Goat in the Garden 3
Ural Championship 2005. Round 2
197
2465
1308
Dean's Pyramid
Ural Championship 2004. Round 1
167
2853
1300
Taxes
Ural Championship 1998
165
2884
1312
Tray
Ural Championship 2004. Round 1
159
2988
1367
Top Secret
Ural Championship 2005. Round 2
155
3093
1381
Cockroaches in the Building
Petrozavodsk Summer 2005. Moscow+Ural Contest
136
3505
1380
Ostap's Chess
Petrozavodsk Summer 2005. Moscow+Ural Contest
112
4194
1344
Gigantic Turnip
USU Championship 2004
103
4509
1365
Testing Calculator
Ural Championship 2005. Round 2
96
4814
1340
Cucaracha
USU Championship 2004
92
4995
1384
Goat in the Garden 4
Petrozavodsk Summer 2005. Moscow+Ural Contest
91
5066
1363
Halftones
Ural Championship 2005. Round 2
85
5371
1391
Snake
Petrozavodsk Summer 2005. Moscow+Ural Contest
85
5386
1372
Death Star
Ural Championship 2005. Round 1
75
6019
1376
Dean's Pyramid 2
Ural Championship 2005. Round 1
44
9474
1390
Shots at Walls
Petrozavodsk Summer 2005. Moscow+Ural Contest
43
9654
1383
Flower-garden Designs
Petrozavodsk Summer 2005. Moscow+Ural Contest
42
9840
1399
Economical Director
33
10849
1374
Misere
Ural Championship 2005. Round 1
37
10885
1369
Cockroach Race
Ural Championship 2005. Round 2
27
13790
1388
Photo
Petrozavodsk Summer 2005. Moscow+Ural Contest
21
16505
1394
Ships. Version 2
19
17644
Solved problems:
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