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 (36 solutions by 9 contestants):
Round 1A (4 solutions by 3 contestants):
Round 1B (12 solutions by 5 contestants):
Round 1C (2 solutions by 1 contestant):

Submission Origin

Ukraine (2 contestants)
India (2 contestants)
Taiwan (1 contestant)
Romania (1 contestant)
Mexico (1 contestant)
Japan (1 contestant)
Egypt (1 contestant)