{"ref":"master","ref_type":"branch","master_branch":"master","description":"Program receives from the command line the name of the file containing the elements: + <non-negative number>, - <non-negative number>,? <non-negative number>. Elements are separated by one or more delimiters - spaces, tabs, newline characters. The number after + is added to the list, if it is not there, the number after - is deleted from the list, if it exists in it. The number after? is checked for the presence in the list","pusher_type":"user"}
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