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AVAILABLE EXERCISES:
Exercise 9
Bitwise operations (bit-ops)
Exercise 8
Frontend
Exercise 7
Data Structures
Exercise 6
SQL
Exercise 5
Coding skills
Exercise 4
Algorithmic skills
Exercise 3
2017 Contest
Exercise 2
2016 Contest
Exercise 1
2015 Contest
Exercise 6

SQL

Tasks:

elementary

SqlSum

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Calculate sum of elements.
easy

SqlEventsDelta

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Compute the difference between the latest and the second latest value for each event type.
medium

SqlWorldCup

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Given a list of matches in a group stage of the soccer World Cup, compute the number of points each team currently has.