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Problem set. Volume 1
Solved problems:
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ID
Title
Source
Authors
Difficulty
1000
A+B Problem
103660
16
1068
Sum
38108
37
1001
Reverse Root
32449
14
1025
Democracy in Danger
Autumn School Contest 2000
22698
67
1083
Factorials!!!
Spring School Contest 2001
19769
67
1005
Stone Pile
USU Championship 1997
19316
79
1009
K-based Numbers
USU Championship 1997
16224
93
1014
Product of Digits
USU Local Contest. 1999
16188
93
1020
Rope
Autumn School Contest 2000
15268
99
1086
Cryptography
Spring School Contest 2001
12594
105
1044
Lucky Tickets. Easy!
USU Championship 2000
12398
120
1079
Maximum
Winter Mathematical Festival Varna 2001
12190
110
1022
Genealogical Tree
Autumn School Contest 2000
10802
140
1082
Gaby Ivanushka
Spring School Contest 2001
10781
123
1021
Sacrament of the Sum
Autumn School Contest 2000
10381
145
1017
Staircases
USU Local Contest. 1999
9726
155
1026
Questions and Answers
Autumn School Contest 2000
9713
155
1073
Square Country
USU Personal Contest 2001
9545
142
1084
Goat in the Garden
Spring School Contest 2001
8913
149
1012
K-based Numbers. Version 2
8570
176
1048
Superlong Sums
USU Local Contest. March 2000
7457
197
1023
Buttons
Autumn School Contest 2000
7115
212
1002
Phone Numbers
Central European Olympiad in Informatics 1999
6790
223
1080
Map Coloring
Winter Mathematical Festival Varna 2001
6709
199
1033
Labyrinth
Ural Championship 1999
6460
233
1052
Rabbit Hunt
USU Local Contest. March 2000
6320
233
1011
Conductors
USU Championship 1997
6213
244
1049
Brave Balloonists
USU Local Contest. March 2000
6005
245
1028
Stars
Ural Championship 1999
5717
263
1018
Binary Apple Tree
USU Local Contest. 1999
5475
276
1010
Discrete Function
USTU PhysTech Cup 2000
5297
286
1081
Binary Lexicographic Sequence
Winter Mathematical Festival Varna 2001
5068
264
1036
Lucky Tickets
5001
301
1047
Simple Calculations
USU Local Contest. March 2000
4995
295
1087
The Time to Take Stones
Spring School Contest 2001
4896
271
1024
Permutations
Autumn School Contest 2000
4806
314
1053
Pinocchio
NEERC 2000 Central Subregional
4392
334
1032
Find a Multiple
Ural Championship 1999
4381
299
1008
Image Encoding
USTU PhysTech Cup 2000
4204
360
1003
Parity
Central European Olympiad in Informatics 1999
3950
384
1031
Railway Tickets
Ural Championship 1999
3947
381
1039
Anniversary Party
USU Championship 2000
3911
381
1078
Segments
Winter Mathematical Festival Varna 2001
3838
348
1007
Code Words
USU Championship 1997
3827
396
1060
Flip Game
NEERC 2000
3788
367
1029
Ministry
Ural Championship 1999
3757
348
1067
Disk Tree
NEERC 2000
3581
388
1055
Combinations
NEERC 2000 Central Subregional
3553
413
1090
In the Army Now
USU Local Contest. March 2001
3498
360
1015
Test the Difference!
USU Local Contest. 1999
3383
446
1019
Line Painting
USU Local Contest. 1999
3302
457
1038
Spell Checker
USU Championship 2000
3121
477
1045
Funny Game
USU Local Contest. March 2000
2849
516
1051
Simple Game on a Grid
USU Local Contest. March 2000
2822
521
1094
E-screen
USU Local Contest. March 2001
2782
452
1072
Routing
USU Personal Contest 2001
2742
492
1056
Centers of the Net
NEERC 2000 Central Subregional
2693
544
1004
Sightseeing Trip
Central European Olympiad in Informatics 1999
2612
580
1069
Prufer Code
USU Personal Contest 2001
2609
517
1066
Garland
NEERC 2000
2442
568
1027
D++ Again
Autumn School Contest 2000
2421
622
1091
Tmutarakan Exams
USU Local Contest. March 2001
2399
524
1054
Tower of Hanoi
NEERC 2000 Central Subregional
2282
642
1059
Expression
NEERC 2000 Central Subregional
2211
663
1095
Nikifor 3
USU Local Contest. March 2001
2211
568
1098
Questions
2206
544
1071
Nikifor 2
USU Personal Contest 2001
2198
613
1064
Binary Search
NEERC 2000
2159
642
1085
Meeting
Spring School Contest 2001
2145
616
1061
Buffer Manager
NEERC 2000
2124
653
1070
Local Time
USU Personal Contest 2001
2057
655
1057
Amount of Degrees
NEERC 2000 Central Subregional
2052
714
1076
Trash
1911
701
1034
Queens in Peaceful Positions
Ural Championship 1999
1882
796
1016
Cube on the Walk
USU Local Contest. 1999
1868
805
1042
Central Heating
USU Championship 2000
1845
805
1088
Ilya Murometz
Spring School Contest 2001
1800
734
1096
Get the Right Route Plate!
USU Local Contest. March 2001
1792
700
1030
Titanic
Ural Championship 1999
1708
877
1089
Verification with the Dictionary
Spring School Contest 2001
1588
831
1006
Square Frames
USU Championship 1997
1562
965
1040
Airline Company
USU Championship 2000
1494
992
1037
Memory Management
USU Championship 2000
1267
1169
1013
K-based Numbers. Version 3
1241
192
1077
Travelling Tours
1221
396
1035
Cross-stitch
Ural Championship 1999
1119
1331
1050
Preparing an Article
USU Local Contest. March 2000
1028
1420
1065
Frontier
NEERC 2000
994
1388
1099
Work Scheduling
993
1138
1097
Square Country 2
USU Local Contest. March 2001
923
1352
1043
Cover an Arc
USU Championship 2000
913
1617
1046
Geometrical Dreams
USU Local Contest. March 2000
781
1864
1062
Triathlon
NEERC 2000
764
1799
1075
Thread in a Space
USU Personal Contest 2001
659
2024
1093
Darts
USU Local Contest. March 2001
633
1962
1074
Very Short Problem
USU Personal Contest 2001
632
2109
1063
Domino Puzzle
NEERC 2000
626
2189
1092
Transversal
USU Local Contest. March 2001
541
2290
1058
Chocolate
NEERC 2000 Central Subregional
518
2780
1041
Nikifor
USU Championship 2000
295
4894
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