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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
62211 / 69478
2
Digits
36667 / 45861
3
Match’s model
4650 / 21273
4
Two circles
10324 / 16802
5
Two factors
2722 / 7518
6
The vouchers
1691 / 2816
7
Roman numerals
3834 / 5586
8
Matches
5443 / 8388
9
N-digit numbers
4006 / 6079
10
Gardener
4234 / 6015
11
Big accuracy
4471 / 7711
12
Injured Picture
1033 / 1584
13
Spider and Fly
1725 / 3344
14
Rabbit-failure
2195 / 3051
15
Mouse and corns
5153 / 6649
16
Dragon
2006 / 3297
17
Gardener-painter
5147 / 6572
18
Paint2D
1041 / 2066
19
Degree of symmetry
8564 / 10147
20
How many times to repeat?
7008 / 10429
21
Corruption
511 / 2474
22
"Mirror prime" numbers
4081 / 6533
23
New-year tree
1082 / 2475
24
Paint2D-Crack
74 / 498
25
Paint3D
808 / 1221