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Problems

Complexity
All Problems Very simple Simple Average Difficult Very difficult
number-theory
All Problems 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 diophantine-equations dynamic-programming euclid-extended-algorithm Others...
2
Digits
23768 / 30651
5
Two factors
1929 / 5140
27
Cycle shifts
3922 / 4792
33
The favourite numbers of Santa Claus
1585 / 2448
43
Competitors’ quantity of olimpia
2611 / 3574
311
Maximum quantity of figures
103 / 143
605
Красивая таблица результатов
269 / 298
656
Игра умножения
524 / 847
660
Intelligent game Prostokvashino (RU)
155 / 181
752
Ahoy, Pirates!
271 / 365
1001
A + B in the binary system
1043 / 1570
1002
Fraction
26 / 57
1003
Nikifor 2
61 / 94
1004
Забавная игра
429 / 499
1005
Matches for children are not toys!
760 / 980
1006
Simple arithmetic
141 / 175
1007
The Stern-Brocot Number System
433 / 460
1008
Number systems
247 / 414
1009
2D-Nim
73 / 82
1010
The equality
26 / 42
1012
Coins
86 / 244
1013
Factorial
195 / 297
1016
Octal Fractions
50 / 90
1017
Fractional arithmetic
48 / 84
1018
Expanding Fractions
80 / 94