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Ingy döt Net 2026-02-01 16:33:20 -08:00
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Task/Sorting-algorithms-Merge-sort/Phix/sorting-algorithms-merge-sort.phix
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@ -1,34 +1,30 @@
(phixonline)-->
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
with javascript_semantics
function merge(sequence left, right)
sequence result = {}
integer ldx = 1, rdx = 1
while length(left)>=ldx
and length(right)>=rdx do
if left[ldx]<=right[rdx] then
result = append(result, left[ldx])
ldx += 1
else
result = append(result, right[rdx])
rdx += 1
end if
end while
return result & left[ldx..$] & right[rdx..$]
end function
<span style="color: #008080;">function</span> <span style="color: #000000;">merge</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">left</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">sequence</span> <span style="color: #000000;">right</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">result</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{}</span>
<span style="color: #008080;">while</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">left</span><span style="color: #0000FF;">)></span><span style="color: #000000;">0</span> <span style="color: #008080;">and</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">right</span><span style="color: #0000FF;">)></span><span style="color: #000000;">0</span> <span style="color: #008080;">do</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">left</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]<=</span><span style="color: #000000;">right</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">then</span>
<span style="color: #000000;">result</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">result</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">left</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">])</span>
<span style="color: #000000;">left</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">left</span><span style="color: #0000FF;">[</span><span style="color: #000000;">2</span><span style="color: #0000FF;">..$]</span>
<span style="color: #008080;">else</span>
<span style="color: #000000;">result</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">result</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">right</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">])</span>
<span style="color: #000000;">right</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">right</span><span style="color: #0000FF;">[</span><span style="color: #000000;">2</span><span style="color: #0000FF;">..$]</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">result</span> <span style="color: #0000FF;">&</span> <span style="color: #000000;">left</span> <span style="color: #0000FF;">&</span> <span style="color: #000000;">right</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
function mergesort(sequence m)
integer middle = floor(length(m)/2)
if middle=0 then return m end if
sequence left = mergesort(m[1..middle]),
right = mergesort(m[middle+1..$])
return iff(left[$]<=right[1]?left & right:
iff(right[$]<=left[1]?right & left:
merge(left, right)))
end function
<span style="color: #008080;">function</span> <span style="color: #000000;">mergesort</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">m</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">m</span><span style="color: #0000FF;">)<=</span><span style="color: #000000;">1</span> <span style="color: #008080;">then</span> <span style="color: #008080;">return</span> <span style="color: #000000;">m</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">middle</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">floor</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">m</span><span style="color: #0000FF;">)/</span><span style="color: #000000;">2</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">left</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">mergesort</span><span style="color: #0000FF;">(</span><span style="color: #000000;">m</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..</span><span style="color: #000000;">middle</span><span style="color: #0000FF;">]),</span>
<span style="color: #000000;">right</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">mergesort</span><span style="color: #0000FF;">(</span><span style="color: #000000;">m</span><span style="color: #0000FF;">[</span><span style="color: #000000;">middle</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..$])</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">left</span><span style="color: #0000FF;">[$]<=</span><span style="color: #000000;">right</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">then</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">left</span> <span style="color: #0000FF;">&</span> <span style="color: #000000;">right</span>
<span style="color: #008080;">elsif</span> <span style="color: #000000;">right</span><span style="color: #0000FF;">[$]<=</span><span style="color: #000000;">left</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">then</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">right</span> <span style="color: #0000FF;">&</span> <span style="color: #000000;">left</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">merge</span><span style="color: #0000FF;">(</span><span style="color: #000000;">left</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">right</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">shuffle</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">tagset</span><span style="color: #0000FF;">(</span><span style="color: #000000;">10</span><span style="color: #0000FF;">))</span>
<span style="color: #0000FF;">?</span> <span style="color: #000000;">s</span>
<span style="color: #0000FF;">?</span> <span style="color: #000000;">mergesort</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">deep_copy</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">))</span>
<!--
constant s = shuffle(tagset(10))
? s
? mergesort(deep_copy(s))