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 (83 solutions by 23 contestants):
Round 1A (15 solutions by 5 contestants):
Round 1B (10 solutions by 5 contestants):
Round 1C (7 solutions by 3 contestants):

Submission Origin

China (4 contestants)
Ukraine (4 contestants)
India (3 contestants)
United States (2 contestants)
Chile (1 contestant)
Egypt (1 contestant)
Hong Kong (1 contestant)
Mexico (1 contestant)
Morocco (1 contestant)
Romania (1 contestant)
South Africa (1 contestant)
Taiwan (1 contestant)
Thailand (1 contestant)
United Kingdom (1 contestant)
Vietnam (1 contestant)