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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
62274 / 69546
2
Digits
36693 / 45889
3
Match’s model
4654 / 21290
4
Two circles
10331 / 16816
5
Two factors
2726 / 7535
6
The vouchers
1694 / 2820
7
Roman numerals
3839 / 5592
8
Matches
5448 / 8395
9
N-digit numbers
4010 / 6086
10
Gardener
4248 / 6030
11
Big accuracy
4484 / 7730
12
Injured Picture
1034 / 1586
13
Spider and Fly
1728 / 3351
14
Rabbit-failure
2198 / 3055
15
Mouse and corns
5166 / 6666
16
Dragon
2007 / 3300
17
Gardener-painter
5159 / 6586
18
Paint2D
1043 / 2071
19
Degree of symmetry
8568 / 10152
20
How many times to repeat?
7032 / 10456
21
Corruption
514 / 2482
22
"Mirror prime" numbers
4083 / 6537
23
New-year tree
1082 / 2477
24
Paint2D-Crack
74 / 498
25
Paint3D
809 / 1223