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 (65 solutions by 23 contestants):
Round 1A (1 solution by 1 contestant):
Round 1B (10 solutions by 6 contestants):
Round 1C (5 solutions by 4 contestants):

Submission Origin

Ukraine (4 contestants)
United States (4 contestants)
Germany (2 contestants)
India (2 contestants)
Vietnam (2 contestants)
Australia (1 contestant)
France (1 contestant)
Israel (1 contestant)
Italy (1 contestant)
Japan (1 contestant)
Jordan (1 contestant)
Latvia (1 contestant)
Taiwan (1 contestant)
Thailand (1 contestant)
United Kingdom (1 contestant)