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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
62262 / 69531
2
Digits
36689 / 45886
3
Match’s model
4653 / 21289
4
Two circles
10329 / 16814
5
Two factors
2725 / 7533
6
The vouchers
1693 / 2819
7
Roman numerals
3837 / 5589
8
Matches
5446 / 8394
9
N-digit numbers
4009 / 6085
10
Gardener
4245 / 6026
11
Big accuracy
4477 / 7719
12
Injured Picture
1033 / 1585
13
Spider and Fly
1726 / 3346
14
Rabbit-failure
2195 / 3052
15
Mouse and corns
5156 / 6655
16
Dragon
2006 / 3297
17
Gardener-painter
5157 / 6584
18
Paint2D
1042 / 2068
19
Degree of symmetry
8567 / 10151
20
How many times to repeat?
7031 / 10454
21
Corruption
513 / 2481
22
"Mirror prime" numbers
4082 / 6534
23
New-year tree
1082 / 2475
24
Paint2D-Crack
74 / 498
25
Paint3D
808 / 1222