Language Details: Objective-C

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Objective-C is a general-purpose, high-level, object-oriented programming language that adds Smalltalk-style messaging to the C programming language.

Objective-C article on Wikipedia

Problems solved

Qualification Round (17 solutions by 7 contestants):
Round 2 (2 solutions by 1 contestant):

Submission Origin

United States (3 contestants)
United Kingdom (2 contestants)
South Korea (1 contestant)
Portugal (1 contestant)
Germany (1 contestant)