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Problems

Average
All Problems Very simple Simple Average Difficult Very difficult
Classification
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...
4
Two circles
8906 / 14409
6
The vouchers
1425 / 2256
8
Matches
4693 / 6992
9
N-digit numbers
3420 / 5134
11
Big accuracy
4029 / 6670
12
Injured Picture
889 / 1344
13
Spider and Fly
1620 / 2958
16
Dragon
1788 / 2832
20
How many times to repeat?
5604 / 8381
22
"Mirror prime" numbers
3008 / 5254
25
Paint3D
640 / 943
33
The favourite numbers of Santa Claus
1816 / 2770
36
Gorynych the Dragon
1318 / 1901
40
Pipeline (RU)
260 / 468
41
Command of the Mayor
425 / 650
48
The Red and Blue Squares
431 / 632
49
The Smart Cat
767 / 1156
50
The cut number
392 / 568
55
The presents to the 8th of March
716 / 1168
62
The Factorial
2177 / 4061
68
Metro
129 / 186
84
Transfer
46 / 73
88
LeChuck’s Revenge
78 / 120
93
Truck Driving
69 / 112
94
Primes’ Problem
56 / 90