19 lines
511 B
Factor
19 lines
511 B
Factor
USING: formatting io kernel math math.parser sequences
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splitting.monotonic ;
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IN: rosetta-code.range-extraction
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: make-range ( seq -- str )
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[ first ] [ last ] bi "%d-%d" sprintf ;
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: make-atomic ( seq -- str ) [ number>string ] map "," join ;
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: extract-range ( seq -- str )
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[ - -1 = ] monotonic-split
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[ dup length 2 > [ make-range ] [ make-atomic ] if ] map
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"," join ;
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{
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0 1 2 4 6 7 8 11 12 14 15 16 17 18 19 20 21 22
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23 24 25 27 28 29 30 31 32 33 35 36 37 38 39
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} extract-range print
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