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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
62154 / 69417
2
Digits
36626 / 45808
3
Match’s model
4646 / 21255
4
Two circles
10320 / 16791
5
Two factors
2720 / 7513
6
The vouchers
1691 / 2815
7
Roman numerals
3830 / 5581
8
Matches
5440 / 8382
9
N-digit numbers
4003 / 6075
10
Gardener
4231 / 6007
11
Big accuracy
4468 / 7704
12
Injured Picture
1033 / 1584
13
Spider and Fly
1725 / 3343
14
Rabbit-failure
2192 / 3048
15
Mouse and corns
5146 / 6643
16
Dragon
2006 / 3291
17
Gardener-painter
5140 / 6563
18
Paint2D
1040 / 2066
19
Degree of symmetry
8558 / 10140
20
How many times to repeat?
7002 / 10414
21
Corruption
509 / 2473
22
"Mirror prime" numbers
4079 / 6531
23
New-year tree
1081 / 2474
24
Paint2D-Crack
74 / 498
25
Paint3D
807 / 1220