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Task/Sorting-algorithms-Heapsort/Phix/sorting-algorithms-heapsort.phix

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+function siftDown(sequence arr, integer s, integer last)
+integer root = s
+    while root*2<=last do
+        integer child = root*2
+        if child<last and arr[child]<arr[child+1] then
+            child += 1
+        end if
+        if arr[root]>=arr[child] then exit end if
+        object tmp = arr[root]
+        arr[root] = arr[child]
+        arr[child] = tmp
+        root = child
+    end while
+    return arr
+end function
+
+function heapify(sequence arr, integer count)
+integer s = floor(count/2)
+    while s>0 do
+        arr = siftDown(arr,s,count)
+        s -= 1
+    end while
+    return arr
+end function
+
+function heap_sort(sequence arr)
+integer last = length(arr)
+    arr = heapify(arr,last)
+    while last>1 do
+        object tmp = arr[1]
+        arr[1] = arr[last]
+        arr[last] = tmp
+        last -= 1
+        arr = siftDown(arr,1,last)
+    end while
+    return arr
+end function
+
+?heap_sort({5,"oranges","and",3,"apples"})