Sorting algorithms/Heapsort: Difference between revisions
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Return</lang>
Output: see PL/I
=={{header|Ring}}==
<lang ring>
test = [4, 65, 2, -31, 0, 99, 2, 83, 782, 1]
see "before sort:" + nl
showarray(test)
heapsort(test)
see "after sort:" + nl
showarray(test)
func heapsort(a)
cheapify(a)
for e = len(a) to 1 step -1
temp = a[e]
a[e] = a[1]
a[1] = temp
siftdown(a, 1, e-1)
next
func cheapify(a)
m = len(a)
for s = floor((m - 1) / 2) to 1 step -1
siftdown(a,s,m)
next
func siftdown(a,s,e)
r = s
while r * 2 + 1 <= e
c = r * 2
if c + 1 <= e
if a[c] < a[c + 1]
c = c + 1
ok
ok
if a[r] < a[c]
temp = a[r]
a[r] = a[c]
a[c] = temp
r = c
else
exit
ok
end
func showarray(vect)
svect = ""
for n = 1 to len(vect)
svect = svect + vect[n] + " "
next
svect = left(svect, len(svect) - 1)
see svect + nl
</lang>
Output:
<pre>
before sort:
4 65 2 -31 0 99 2 83 782 1
after sort:
-31 0 1 2 2 4 65 83 99 782
</pre>
=={{header|Ruby}}==
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