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Problems

Implementation
Difficulty
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2714
Signboard
Very easy
2716
For five rubles
Very easy
2724
Sequence Folding
2730
Calculator
Very easy
2736
ClosedCup
2739
Language
Very hard
2740
"Penguin"
Very hard
2746
Spy Message
Medium
2751
Iterated Difference
2752
Shape Number
Very easy
2754
Contour Tracing
Very easy
2757
User Names
2758
Citizenship Application
Very easy
2762
Bacon`s Cipher
Very easy
2766
Length of S(n)
Very easy
2772
DDR3
Very hard
2777
Houses
Very easy
2779
Traffic Lights
Easy
2790
Damaged XML
2792
Rectangle
Very easy
2795
Metro
Easy
2799
Gnome in the Castle
Easy
2812
Angle
Very easy
2828
Polynomial
2831
HTML
Hard
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