Problems
Simple problem#1
Very easy
Digits#2
Very easy · For Beginners
Match’s model#3
Medium · Geometry
Two circles#4
Easy · Geometry · For Beginners
Two factors#5
Medium
The Vouchers#6
Hard · Dynamic programming · Brute force
Roman numerals#7
Easy
Matches#8
Easy · For Beginners
N-digit numbers#9
Very easy · Brute force
Gardener#10
Easy
Big accuracy#11
Easy · Number theory
Damaged Picture#12
Easy · Geometry
Spider and Fly#13
Easy · Geometry
The Ticket Chase#14
Very easy
Mouse and corns#15
Medium · Dynamic programming
Dragon#16
Medium · Implementation · Math
Gardener-painter#17
Easy · Combinatorics · Dynamic programming
Paint2D#18
Medium · Dynamic programming
Degree of symmetry#19
Very easy · Implementation
Corruption#21
Easy · Sorting · Greedy algorithms
"Mirror prime" numbers#22
Easy · Brute force
New-year tree#23
Medium
Paint2D-Crack#24
Hard
Paint3D#25
Easy · Dynamic programming
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