Doubly-linked list/Traversal: Difference between revisions
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=={{header|Phix}}== |
=={{header|Phix}}== |
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<lang Phix> |
<!--<lang Phix>(phixonline)--> |
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<span style="color: #008080;">enum</span> <span style="color: #000000;">NEXT</span><span style="color: #0000FF;">,</span><span style="color: #000000;">PREV</span><span style="color: #0000FF;">,</span><span style="color: #000000;">DATA</span> |
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constant empty_dll = {{1,1}} |
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<span style="color: #008080;">constant</span> <span style="color: #000000;">empty_dll</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{{</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">}}</span> |
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sequence dll = empty_dll |
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<span style="color: #004080;">sequence</span> <span style="color: #000000;">dll</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">deep_copy</span><span style="color: #0000FF;">(</span><span style="color: #000000;">empty_dll</span><span style="color: #0000FF;">)</span> |
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procedure insert_after(object data, integer pos=1) |
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<span style="color: #008080;">procedure</span> <span style="color: #000000;">insert_after</span><span style="color: #0000FF;">(</span><span style="color: #004080;">object</span> <span style="color: #000000;">data</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">pos</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span> |
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integer prv = dll[pos][PREV] |
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<span style="color: #004080;">integer</span> <span style="color: #000000;">prv</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">dll</span><span style="color: #0000FF;">[</span><span style="color: #000000;">pos</span><span style="color: #0000FF;">][</span><span style="color: #000000;">PREV</span><span style="color: #0000FF;">]</span> |
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dll = append(dll,{pos,prv,data}) |
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<span style="color: #000000;">dll</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dll</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">pos</span><span style="color: #0000FF;">,</span><span style="color: #000000;">prv</span><span style="color: #0000FF;">,</span><span style="color: #000000;">data</span><span style="color: #0000FF;">})</span> |
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if prv!=0 then |
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<span style="color: #008080;">if</span> <span style="color: #000000;">prv</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span> |
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dll[prv][NEXT] = length(dll) |
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<span style="color: #000000;">dll</span><span style="color: #0000FF;">[</span><span style="color: #000000;">prv</span><span style="color: #0000FF;">][</span><span style="color: #000000;">NEXT</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dll</span><span style="color: #0000FF;">)</span> |
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end if |
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<span style="color: #008080;">end</span> <span style="color: #008080;">if</span> |
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dll[pos][PREV] = length(dll) |
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<span style="color: #000000;">dll</span><span style="color: #0000FF;">[</span><span style="color: #000000;">pos</span><span style="color: #0000FF;">][</span><span style="color: #000000;">PREV</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dll</span><span style="color: #0000FF;">)</span> |
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end procedure |
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<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span> |
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insert_after("ONE") |
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<span style="color: #000000;">insert_after</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"ONE"</span><span style="color: #0000FF;">)</span> |
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insert_after("TWO") |
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<span style="color: #000000;">insert_after</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"TWO"</span><span style="color: #0000FF;">)</span> |
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insert_after("THREE") |
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<span style="color: #000000;">insert_after</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"THREE"</span><span style="color: #0000FF;">)</span> |
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?dll |
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<span style="color: #0000FF;">?</span><span style="color: #000000;">dll</span> |
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procedure show(integer d) |
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<span style="color: #008080;">procedure</span> <span style="color: #000000;">show</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">d</span><span style="color: #0000FF;">)</span> |
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integer idx = dll[1][d] |
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<span style="color: #004080;">integer</span> <span style="color: #000000;">idx</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">dll</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">][</span><span style="color: #000000;">d</span><span style="color: #0000FF;">]</span> |
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while idx!=1 do |
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<span style="color: #008080;">while</span> <span style="color: #000000;">idx</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">1</span> <span style="color: #008080;">do</span> |
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?dll[idx][DATA] |
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<span style="color: #0000FF;">?</span><span style="color: #000000;">dll</span><span style="color: #0000FF;">[</span><span style="color: #000000;">idx</span><span style="color: #0000FF;">][</span><span style="color: #000000;">DATA</span><span style="color: #0000FF;">]</span> |
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idx = dll[idx][d] |
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<span style="color: #000000;">idx</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">dll</span><span style="color: #0000FF;">[</span><span style="color: #000000;">idx</span><span style="color: #0000FF;">][</span><span style="color: #000000;">d</span><span style="color: #0000FF;">]</span> |
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end while |
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<span style="color: #008080;">end</span> <span style="color: #008080;">while</span> |
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end procedure |
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<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span> |
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show(NEXT) |
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<span style="color: #000000;">show</span><span style="color: #0000FF;">(</span><span style="color: #000000;">NEXT</span><span style="color: #0000FF;">)</span> |
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?"==" |
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<span style="color: #0000FF;">?</span><span style="color: #008000;">"=="</span> |
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show(PREV)</lang> |
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<span style="color: #000000;">show</span><span style="color: #0000FF;">(</span><span style="color: #000000;">PREV</span><span style="color: #0000FF;">)</span> |
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<!--</lang>--> |
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{{out}} |
{{out}} |
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<pre> |
<pre> |