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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
62247 / 69514
2
Digits
36684 / 45880
3
Match’s model
4653 / 21285
4
Two circles
10325 / 16808
5
Two factors
2725 / 7527
6
The vouchers
1692 / 2818
7
Roman numerals
3836 / 5587
8
Matches
5445 / 8392
9
N-digit numbers
4007 / 6083
10
Gardener
4243 / 6022
11
Big accuracy
4474 / 7716
12
Injured Picture
1033 / 1585
13
Spider and Fly
1726 / 3345
14
Rabbit-failure
2195 / 3052
15
Mouse and corns
5155 / 6653
16
Dragon
2006 / 3297
17
Gardener-painter
5152 / 6577
18
Paint2D
1042 / 2066
19
Degree of symmetry
8566 / 10149
20
How many times to repeat?
7024 / 10448
21
Corruption
512 / 2479
22
"Mirror prime" numbers
4081 / 6533
23
New-year tree
1082 / 2475
24
Paint2D-Crack
74 / 498
25
Paint3D
808 / 1221