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Problems

Complexity
All Problems Very simple Simple Average Difficult Very difficult
number-theory
All Problems ---topological-sort- ---traveling-salesman-problem- -three- 2-sat algorithms-on-strings articulation-point backtracking beginners bellman-ford-algorithm binary-search bitwise-operators breadth-first-search bridges calculation-system catalan-numbers clique combinatorics connected-components depth-first-search dijkstra-algorithm Others...
2
Digits
26702 / 34087
5
Two factors
2060 / 5549
27
Cycle shifts
4222 / 5134
33
The favourite numbers of Santa Claus
1681 / 2580
43
Competitors’ quantity of olimpia
2721 / 3735
311
Maximum quantity of figures
106 / 147
605
Красивая таблица результатов
284 / 316
656
Игра умножения
543 / 874
660
Intelligent game Prostokvashino (RU)
158 / 184
752
Ahoy, Pirates!
281 / 377
1001
A + B in the binary system
1116 / 1670
1002
Fraction
27 / 58
1003
Nikifor 2
61 / 95
1004
Забавная игра
430 / 500
1005
Matches for children are not toys!
828 / 1076
1006
Simple arithmetic
142 / 177
1007
The Stern-Brocot Number System
474 / 503
1008
Number systems
304 / 502
1009
2D-Nim
78 / 87
1010
The equality
26 / 42
1012
Coins
89 / 247
1013
Factorial
208 / 323
1016
Octal Fractions
50 / 90
1017
Fractional arithmetic
56 / 94
1018
Expanding Fractions
86 / 100