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


~~Stream~~ (4 sets) ~~.max~~ (3 sets)	~~Seventoes~~ (2 sets) ~~lid~~ (3 sets)	~~tesseractor~~ (1 set)

Problems solved

Qualification Round (12 solutions by 5 contestants):

Alien Language: 5 small solutions, 4 large solutions.
Watersheds: 1 small solution.
Welcome to Code Jam: 2 small solutions.

Round 1C (1 solution by 1 contestant):

All Your Base: 1 small solution.

Submission Origin

United States (3 contestants)
Russia (1 contestant)
Belarus (1 contestant)