Problems
Spiral#841
Easy · Implementation
The prime factors#842
Easy · Prime factorization · Implementation
Permutation of letters#843
Very easy · Combinatorics
Moneybox#844
Very easy · Dynamic programming
The card and envelope#845
Medium · Implementation
Long product#846
Medium · Math
Snake#847
Very easy · Implementation
Perfect numbers#848
Easy · Implementation
Decomposition into terms#849
Very easy · Brute force
Gangsters#850
Very easy · Dynamic programming
The area of a polygon#851
Very easy · Geometry
Long division on a short number#852
Very easy · Implementation
Sereja and Array#853
Very easy · Stacks
Amicable numbers#854
Easy · Implementation
Brackets (2)#855
Very easy · Brute force
Route 2#856
Very easy · Dynamic programming
Convex hull#857
Very easy · Convex Hull
Birthday#858
Very easy · Implementation
Sums#859
Very easy · Dynamic programming
The game of "Date"#860
Easy · Implementation · Brute force
Matrix Summation#861
Very easy · Prefix Sums · Implementation
Message#862
Easy · Dynamic programming · Math
Line and squares#863
Very easy · Geometry
SMS#864
Very easy · Dynamic programming
Arc on the sphere#865
Very easy · Geometry
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