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Problem set. Volume 1
Solved problems:
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ID
Title
Source
Authors
Difficulty
1000
A+B Problem
103767
16
1068
Sum
38157
37
1001
Reverse Root
32502
14
1025
Democracy in Danger
Autumn School Contest 2000
22738
67
1083
Factorials!!!
Spring School Contest 2001
19792
67
1005
Stone Pile
USU Championship 1997
19340
79
1009
K-based Numbers
USU Championship 1997
16232
93
1014
Product of Digits
USU Local Contest. 1999
16201
93
1020
Rope
Autumn School Contest 2000
15311
99
1086
Cryptography
Spring School Contest 2001
12607
105
1044
Lucky Tickets. Easy!
USU Championship 2000
12411
120
1079
Maximum
Winter Mathematical Festival Varna 2001
12205
110
1022
Genealogical Tree
Autumn School Contest 2000
10811
140
1082
Gaby Ivanushka
Spring School Contest 2001
10785
123
1021
Sacrament of the Sum
Autumn School Contest 2000
10385
146
1017
Staircases
USU Local Contest. 1999
9734
156
1026
Questions and Answers
Autumn School Contest 2000
9719
156
1073
Square Country
USU Personal Contest 2001
9604
141
1084
Goat in the Garden
Spring School Contest 2001
8919
149
1012
K-based Numbers. Version 2
8573
177
1048
Superlong Sums
USU Local Contest. March 2000
7460
197
1023
Buttons
Autumn School Contest 2000
7117
212
1002
Phone Numbers
Central European Olympiad in Informatics 1999
6794
223
1080
Map Coloring
Winter Mathematical Festival Varna 2001
6749
198
1033
Labyrinth
Ural Championship 1999
6487
232
1052
Rabbit Hunt
USU Local Contest. March 2000
6322
233
1011
Conductors
USU Championship 1997
6215
244
1049
Brave Balloonists
USU Local Contest. March 2000
6009
245
1028
Stars
Ural Championship 1999
5720
263
1018
Binary Apple Tree
USU Local Contest. 1999
5477
276
1010
Discrete Function
USTU PhysTech Cup 2000
5299
286
1081
Binary Lexicographic Sequence
Winter Mathematical Festival Varna 2001
5073
264
1036
Lucky Tickets
5005
301
1047
Simple Calculations
USU Local Contest. March 2000
4995
295
1087
The Time to Take Stones
Spring School Contest 2001
4899
271
1024
Permutations
Autumn School Contest 2000
4808
314
1053
Pinocchio
NEERC 2000 Central Subregional
4397
334
1032
Find a Multiple
Ural Championship 1999
4384
299
1008
Image Encoding
USTU PhysTech Cup 2000
4225
359
1003
Parity
Central European Olympiad in Informatics 1999
3953
384
1031
Railway Tickets
Ural Championship 1999
3950
381
1039
Anniversary Party
USU Championship 2000
3915
381
1078
Segments
Winter Mathematical Festival Varna 2001
3841
348
1007
Code Words
USU Championship 1997
3828
396
1060
Flip Game
NEERC 2000
3792
367
1029
Ministry
Ural Championship 1999
3759
348
1067
Disk Tree
NEERC 2000
3725
373
1055
Combinations
NEERC 2000 Central Subregional
3553
414
1090
In the Army Now
USU Local Contest. March 2001
3501
360
1015
Test the Difference!
USU Local Contest. 1999
3386
446
1019
Line Painting
USU Local Contest. 1999
3302
457
1038
Spell Checker
USU Championship 2000
3123
477
1045
Funny Game
USU Local Contest. March 2000
2852
516
1051
Simple Game on a Grid
USU Local Contest. March 2000
2824
521
1094
E-screen
USU Local Contest. March 2001
2783
452
1072
Routing
USU Personal Contest 2001
2742
493
1056
Centers of the Net
NEERC 2000 Central Subregional
2695
545
1069
Prufer Code
USU Personal Contest 2001
2621
515
1004
Sightseeing Trip
Central European Olympiad in Informatics 1999
2614
580
1066
Garland
NEERC 2000
2446
568
1027
D++ Again
Autumn School Contest 2000
2422
622
1091
Tmutarakan Exams
USU Local Contest. March 2001
2404
523
1054
Tower of Hanoi
NEERC 2000 Central Subregional
2284
642
1095
Nikifor 3
USU Local Contest. March 2001
2213
568
1059
Expression
NEERC 2000 Central Subregional
2211
663
1098
Questions
2209
544
1071
Nikifor 2
USU Personal Contest 2001
2199
614
1064
Binary Search
NEERC 2000
2159
643
1085
Meeting
Spring School Contest 2001
2147
616
1061
Buffer Manager
NEERC 2000
2127
653
1070
Local Time
USU Personal Contest 2001
2076
650
1057
Amount of Degrees
NEERC 2000 Central Subregional
2053
714
1076
Trash
1911
702
1034
Queens in Peaceful Positions
Ural Championship 1999
1883
797
1016
Cube on the Walk
USU Local Contest. 1999
1868
806
1042
Central Heating
USU Championship 2000
1848
804
1088
Ilya Murometz
Spring School Contest 2001
1803
733
1096
Get the Right Route Plate!
USU Local Contest. March 2001
1795
700
1030
Titanic
Ural Championship 1999
1711
877
1089
Verification with the Dictionary
Spring School Contest 2001
1590
831
1006
Square Frames
USU Championship 1997
1563
966
1040
Airline Company
USU Championship 2000
1495
993
1037
Memory Management
USU Championship 2000
1269
1168
1013
K-based Numbers. Version 3
1246
192
1077
Travelling Tours
1222
397
1035
Cross-stitch
Ural Championship 1999
1120
1332
1050
Preparing an Article
USU Local Contest. March 2000
1028
1422
1065
Frontier
NEERC 2000
995
1388
1099
Work Scheduling
994
1138
1097
Square Country 2
USU Local Contest. March 2001
923
1354
1043
Cover an Arc
USU Championship 2000
913
1619
1046
Geometrical Dreams
USU Local Contest. March 2000
782
1864
1062
Triathlon
NEERC 2000
765
1799
1075
Thread in a Space
USU Personal Contest 2001
661
2021
1093
Darts
USU Local Contest. March 2001
635
1959
1074
Very Short Problem
USU Personal Contest 2001
632
2112
1063
Domino Puzzle
NEERC 2000
627
2188
1092
Transversal
USU Local Contest. March 2001
541
2293
1058
Chocolate
NEERC 2000 Central Subregional
518
2784
1041
Nikifor
USU Championship 2000
295
4900
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