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For challenges involving concurrency, which is when different threads of execution interact with each other.

2 votes

Wait a minute – in less than ten seconds

Common Lisp (SBCL) 166 bytes: (do((m #1=(get-internal-real-time))(o(list 0)))((>(car o)60000)`(,(car o),(- #1#m)))(sb-thread:make-thread(lambda(&aux(s #1#))(sleep 1)(atomic-incf(car o)(- #1#s))))) …
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