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Problems

Complexity
All Problems Very simple Simple Average Difficult Very difficult
Simple mathematics
All Problems Combinatorics Comforting task Game theory Graph theory Long arithmetic Modeling Number theory Probability Simple mathematics Test problem Others...
1
Simple problem
38031 / 42636
3
Match’s model
2744 / 13176
58
The Billiards
885 / 1201
63
Anfisa and the flowers
5098 / 6155
67
Cheese for Anfisa - 2
3142 / 3561
109
Page numbering
2771 / 3862
111
Clocks
1235 / 1902
116
Long number (RU)
576 / 1005
117
Raft
1018 / 1261
119
Degree of two
1610 / 2150
127
Dollars in bank
1980 / 2695
132
Broken line (RU)
78 / 242
133
Square and points (RU)
5174 / 5778
140
Financial pyramid (RU)
723 / 954
186
Egyptian symbols
523 / 701
219
Central heating
3391 / 4091
255
License Software
1861 / 2325
273
Modular Exponentiation
3024 / 3919
583
Airplane (RU)
137 / 467
933
The sum of digits of a two-digit number
6639 / 8142
935
Decomposition of three digit number
8371 / 9595
936
Cramer's Formula
1644 / 2083
937
Product of Array Except Self
3578 / 4726
942
Diagonals
2732 / 2982
1005
Matches for children are not toys!
752 / 968