Rosetta Code

Sorting algorithms/Heapsort: Difference between revisions

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Sorting algorithms/Heapsort (view source)

Revision as of 17:46, 15 November 2012

20 bytes removed ,  11 years ago
BBC BASIC: No reason to limit the sort to integers.
(Added BBC BASIC)
(BBC BASIC: No reason to limit the sort to integers.)
Line 195:
 
=={{header|BBC BASIC}}==
<lang bbcbasic> DIM test%(9)
test%() = 4, 65, 2, -31, 0, 99, 2, 83, 782, 1
PROCheapsort(test%())
FOR i% = 0 TO 9
PRINT test%(i%) ;
NEXT
PRINT
END
DEF PROCheapsort(a%())
LOCAL e%
PROCheapify(a%())
FOR e% = DIM(a%(),1) TO 1 STEP -1
SWAP a%(e%), a%(0)
PROCsiftdown(a%(), 0, e%-1)
NEXT
ENDPROC
DEF PROCheapify(a%())
LOCAL s%, m%
m% = DIM(a%(),1)
FOR s% = (m% - 1) / 2 TO 0 STEP -1
PROCsiftdown(a%(), s%, m%)
NEXT
ENDPROC
DEF PROCsiftdown(a%(), s%, e%)
LOCAL c%, r%
r% = s%
WHILE r% * 2 + 1 <= e%
c% = r% * 2 + 1
IF c% + 1 <= e% IF a%(c%) < a%(c% + 1) c% += 1
IF a%(r%) < a%(c%) SWAP a%(r%), a%(c%) : r% = c% ELSE ENDPROC
ENDWHILE
ENDPROC</lang>
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