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Problems

Complexity
All Problems Very simple Simple Average Difficult Very difficult
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...
1
Simple problem
62138 / 69397
2
Digits
36616 / 45798
3
Match’s model
4641 / 21250
4
Two circles
10319 / 16787
5
Two factors
2719 / 7512
6
The vouchers
1690 / 2813
7
Roman numerals
3828 / 5579
8
Matches
5440 / 8381
9
N-digit numbers
4003 / 6073
10
Gardener
4231 / 6007
11
Big accuracy
4466 / 7699
12
Injured Picture
1033 / 1584
13
Spider and Fly
1725 / 3341
14
Rabbit-failure
2189 / 3045
15
Mouse and corns
5145 / 6640
16
Dragon
2006 / 3291
17
Gardener-painter
5138 / 6559
18
Paint2D
1038 / 2064
19
Degree of symmetry
8557 / 10138
20
How many times to repeat?
7001 / 10412
21
Corruption
508 / 2472
22
"Mirror prime" numbers
4078 / 6530
23
New-year tree
1081 / 2473
24
Paint2D-Crack
74 / 498
25
Paint3D
804 / 1217