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Problem set. Volume 1
Solved problems:
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ID
Title
Source
Authors
Difficulty
1000
A+B Problem
103810
16
1068
Sum
38169
37
1001
Reverse Root
32521
14
1025
Democracy in Danger
Autumn School Contest 2000
22748
67
1083
Factorials!!!
Spring School Contest 2001
19801
67
1005
Stone Pile
USU Championship 1997
19353
79
1009
K-based Numbers
USU Championship 1997
16236
94
1014
Product of Digits
USU Local Contest. 1999
16209
93
1020
Rope
Autumn School Contest 2000
15316
99
1086
Cryptography
Spring School Contest 2001
12610
105
1044
Lucky Tickets. Easy!
USU Championship 2000
12418
120
1079
Maximum
Winter Mathematical Festival Varna 2001
12210
110
1022
Genealogical Tree
Autumn School Contest 2000
10834
140
1082
Gaby Ivanushka
Spring School Contest 2001
10786
123
1021
Sacrament of the Sum
Autumn School Contest 2000
10386
146
1017
Staircases
USU Local Contest. 1999
9738
156
1026
Questions and Answers
Autumn School Contest 2000
9723
156
1073
Square Country
USU Personal Contest 2001
9610
141
1084
Goat in the Garden
Spring School Contest 2001
8922
149
1012
K-based Numbers. Version 2
8575
177
1048
Superlong Sums
USU Local Contest. March 2000
7463
197
1023
Buttons
Autumn School Contest 2000
7120
212
1080
Map Coloring
Winter Mathematical Festival Varna 2001
6939
193
1002
Phone Numbers
Central European Olympiad in Informatics 1999
6797
223
1033
Labyrinth
Ural Championship 1999
6488
232
1052
Rabbit Hunt
USU Local Contest. March 2000
6324
233
1011
Conductors
USU Championship 1997
6215
244
1049
Brave Balloonists
USU Local Contest. March 2000
6011
245
1028
Stars
Ural Championship 1999
5722
263
1018
Binary Apple Tree
USU Local Contest. 1999
5478
276
1010
Discrete Function
USTU PhysTech Cup 2000
5300
286
1081
Binary Lexicographic Sequence
Winter Mathematical Festival Varna 2001
5074
264
1036
Lucky Tickets
5011
301
1047
Simple Calculations
USU Local Contest. March 2000
4997
295
1087
The Time to Take Stones
Spring School Contest 2001
4900
271
1024
Permutations
Autumn School Contest 2000
4809
314
1053
Pinocchio
NEERC 2000 Central Subregional
4397
335
1032
Find a Multiple
Ural Championship 1999
4385
299
1008
Image Encoding
USTU PhysTech Cup 2000
4227
359
1003
Parity
Central European Olympiad in Informatics 1999
3954
384
1031
Railway Tickets
Ural Championship 1999
3950
381
1039
Anniversary Party
USU Championship 2000
3916
381
1078
Segments
Winter Mathematical Festival Varna 2001
3842
348
1007
Code Words
USU Championship 1997
3831
396
1060
Flip Game
NEERC 2000
3793
367
1029
Ministry
Ural Championship 1999
3760
348
1067
Disk Tree
NEERC 2000
3755
370
1055
Combinations
NEERC 2000 Central Subregional
3556
413
1090
In the Army Now
USU Local Contest. March 2001
3501
360
1015
Test the Difference!
USU Local Contest. 1999
3388
446
1019
Line Painting
USU Local Contest. 1999
3304
457
1038
Spell Checker
USU Championship 2000
3124
477
1045
Funny Game
USU Local Contest. March 2000
2852
516
1051
Simple Game on a Grid
USU Local Contest. March 2000
2826
521
1094
E-screen
USU Local Contest. March 2001
2783
453
1072
Routing
USU Personal Contest 2001
2743
493
1056
Centers of the Net
NEERC 2000 Central Subregional
2695
545
1069
Prufer Code
USU Personal Contest 2001
2621
516
1004
Sightseeing Trip
Central European Olympiad in Informatics 1999
2614
580
1066
Garland
NEERC 2000
2448
567
1027
D++ Again
Autumn School Contest 2000
2424
622
1091
Tmutarakan Exams
USU Local Contest. March 2001
2409
523
1054
Tower of Hanoi
NEERC 2000 Central Subregional
2286
642
1095
Nikifor 3
USU Local Contest. March 2001
2214
568
1059
Expression
NEERC 2000 Central Subregional
2212
663
1098
Questions
2209
544
1071
Nikifor 2
USU Personal Contest 2001
2200
614
1064
Binary Search
NEERC 2000
2159
644
1085
Meeting
Spring School Contest 2001
2148
616
1061
Buffer Manager
NEERC 2000
2127
653
1070
Local Time
USU Personal Contest 2001
2077
650
1057
Amount of Degrees
NEERC 2000 Central Subregional
2055
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
807
1042
Central Heating
USU Championship 2000
1848
805
1088
Ilya Murometz
Spring School Contest 2001
1805
733
1096
Get the Right Route Plate!
USU Local Contest. March 2001
1796
700
1030
Titanic
Ural Championship 1999
1711
877
1089
Verification with the Dictionary
Spring School Contest 2001
1591
831
1006
Square Frames
USU Championship 1997
1563
966
1040
Airline Company
USU Championship 2000
1497
992
1037
Memory Management
USU Championship 2000
1269
1169
1013
K-based Numbers. Version 3
1246
192
1077
Travelling Tours
1226
395
1035
Cross-stitch
Ural Championship 1999
1120
1333
1050
Preparing an Article
USU Local Contest. March 2000
1030
1420
1065
Frontier
NEERC 2000
995
1389
1099
Work Scheduling
995
1138
1097
Square Country 2
USU Local Contest. March 2001
923
1355
1043
Cover an Arc
USU Championship 2000
913
1620
1046
Geometrical Dreams
USU Local Contest. March 2000
782
1865
1062
Triathlon
NEERC 2000
765
1800
1075
Thread in a Space
USU Personal Contest 2001
661
2022
1093
Darts
USU Local Contest. March 2001
635
1960
1074
Very Short Problem
USU Personal Contest 2001
632
2113
1063
Domino Puzzle
NEERC 2000
627
2189
1092
Transversal
USU Local Contest. March 2001
542
2290
1058
Chocolate
NEERC 2000 Central Subregional
518
2785
1041
Nikifor
USU Championship 2000
295
4902
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