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Problems

Complexity
All Problems Very simple Simple Average Difficult Very difficult
number-theory
All Problems ---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 diophantine-equations Others...
2
Digits
29473 / 37347
5
Two factors
2286 / 6067
27
Cycle shifts
4501 / 5448
33
The favourite numbers of Santa Claus
1816 / 2770
43
Competitors’ quantity of olimpia
2838 / 3909
311
Maximum quantity of figures
107 / 150
605
Красивая таблица результатов
294 / 326
656
Игра умножения
573 / 912
660
Intelligent game Prostokvashino (RU)
170 / 197
752
Ahoy, Pirates!
341 / 440
1001
A + B in the binary system
1335 / 1937
1002
Fraction
27 / 60
1003
Nikifor 2
79 / 114
1004
Забавная игра
506 / 587
1005
Matches for children are not toys!
945 / 1212
1006
Simple arithmetic
187 / 223
1007
The Stern-Brocot Number System
592 / 622
1008
Number systems
358 / 584
1009
2D-Nim
166 / 177
1010
The equality
29 / 46
1012
Coins
98 / 270
1013
Factorial
263 / 384
1016
Octal Fractions
65 / 108
1017
Fractional arithmetic
64 / 103
1018
Expanding Fractions
165 / 184