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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
62227 / 69492
2
Digits
36673 / 45869
3
Match’s model
4652 / 21278
4
Two circles
10324 / 16804
5
Two factors
2723 / 7519
6
The vouchers
1692 / 2816
7
Roman numerals
3835 / 5586
8
Matches
5443 / 8390
9
N-digit numbers
4007 / 6081
10
Gardener
4238 / 6016
11
Big accuracy
4471 / 7711
12
Injured Picture
1033 / 1584
13
Spider and Fly
1725 / 3344
14
Rabbit-failure
2195 / 3052
15
Mouse and corns
5153 / 6649
16
Dragon
2006 / 3297
17
Gardener-painter
5150 / 6575
18
Paint2D
1041 / 2066
19
Degree of symmetry
8565 / 10148
20
How many times to repeat?
7014 / 10434
21
Corruption
511 / 2475
22
"Mirror prime" numbers
4081 / 6533
23
New-year tree
1082 / 2475
24
Paint2D-Crack
74 / 498
25
Paint3D
808 / 1221