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Problems

Implementation
Difficulty
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841
Spiral
842
The prime factors
Very easy
845
The card and envelope
Medium
847
Snake
Very easy
848
Perfect numbers
Easy
852
Long division on a short number
Very easy
854
Friendly numbers
Easy
858
Birthday
Very easy
860
The game of "Date"
Easy
861
Matrix Summation
Very easy
866
Computer Dialogue
Very easy
879
Plumbing
Easy
881
D-44
Easy
883
Cricket field
Hard
887
Seeds
Very easy
891
Покупка цветов
Easy
895
Falsification of results
Medium
897
Dictionary
Easy
939
The square of the sum
941
Difference
Very easy
943
Digits permutation in 3-digit integer
Very easy
945
Without the middle
949
Two digits from four digits
951
Swap the middle
955
The square of sum
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