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Ingy döt Net 2026-04-30 12:34:36 -04:00
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Task/Knapsack-problem-Continuous/Phix/knapsack-problem-continuous.phix
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(phixonline)-->
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">meats</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span>
<span style="color: #000080;font-style:italic;">--Item Weight (kg) Price (Value)</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">"beef"</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">3.8</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">36</span><span style="color: #0000FF;">},</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">"pork"</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">5.4</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">43</span><span style="color: #0000FF;">},</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">"ham"</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">3.6</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">90</span><span style="color: #0000FF;">},</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">"greaves"</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">2.4</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">45</span><span style="color: #0000FF;">},</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">"flitch"</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">4.0</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">30</span><span style="color: #0000FF;">},</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">"brawn"</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">2.5</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">56</span><span style="color: #0000FF;">},</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">"welt"</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">3.7</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">67</span><span style="color: #0000FF;">},</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">"salami"</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">3.0</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">95</span><span style="color: #0000FF;">},</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">"sausage"</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">5.9</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">98</span><span style="color: #0000FF;">}}</span>
with javascript_semantics
constant meats = {
--Item Weight (kg) Price (Value)
{"beef", 3.8, 36},
{"pork", 5.4, 43},
{"ham", 3.6, 90},
{"greaves", 2.4, 45},
{"flitch", 4.0, 30},
{"brawn", 2.5, 56},
{"welt", 3.7, 67},
{"salami", 3.0, 95},
{"sausage", 5.9, 98}}
<span style="color: #008080;">function</span> <span style="color: #000000;">by_weighted_value</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">j</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">atom</span> <span style="color: #0000FF;">{?,</span><span style="color: #000000;">weighti</span><span style="color: #0000FF;">,</span><span style="color: #000000;">pricei</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">meats</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">],</span>
<span style="color: #0000FF;">{?,</span><span style="color: #000000;">weightj</span><span style="color: #0000FF;">,</span><span style="color: #000000;">pricej</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">meats</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]</span>
<span style="color: #008080;">return</span> <span style="color: #7060A8;">compare</span><span style="color: #0000FF;">(</span><span style="color: #000000;">pricej</span><span style="color: #0000FF;">/</span><span style="color: #000000;">weightj</span><span style="color: #0000FF;">,</span><span style="color: #000000;">pricei</span><span style="color: #0000FF;">/</span><span style="color: #000000;">weighti</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
function by_weighted_value(integer i, j)
atom {?,weighti,pricei} = meats[i],
{?,weightj,pricej} = meats[j]
return compare(pricej/weightj,pricei/weighti)
end function
<span style="color: #004080;">sequence</span> <span style="color: #000000;">tags</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">custom_sort</span><span style="color: #0000FF;">(</span><span style="color: #000000;">by_weighted_value</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">tagset</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">meats</span><span style="color: #0000FF;">)))</span>
sequence tags = custom_sort(by_weighted_value,tagset(length(meats)))
<span style="color: #004080;">atom</span> <span style="color: #000000;">weight</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">15</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">worth</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">tags</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
<span style="color: #004080;">object</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">desc</span><span style="color: #0000FF;">,</span><span style="color: #000000;">wi</span><span style="color: #0000FF;">,</span><span style="color: #000000;">price</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">meats</span><span style="color: #0000FF;">[</span><span style="color: #000000;">tags</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]]</span>
<span style="color: #004080;">atom</span> <span style="color: #000000;">amt</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">min</span><span style="color: #0000FF;">(</span><span style="color: #000000;">wi</span><span style="color: #0000FF;">,</span><span style="color: #000000;">weight</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%3.1fkg %s %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">amt</span><span style="color: #0000FF;">,</span><span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #000000;">amt</span><span style="color: #0000FF;">=</span><span style="color: #000000;">wi</span><span style="color: #0000FF;">?</span><span style="color: #008000;">"(all the)"</span><span style="color: #0000FF;">:</span><span style="color: #008000;">"of"</span><span style="color: #0000FF;">),</span><span style="color: #000000;">desc</span><span style="color: #0000FF;">})</span>
<span style="color: #000000;">worth</span> <span style="color: #0000FF;">+=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">amt</span><span style="color: #0000FF;">/</span><span style="color: #000000;">wi</span><span style="color: #0000FF;">)*</span><span style="color: #000000;">price</span>
<span style="color: #000000;">weight</span> <span style="color: #0000FF;">-=</span> <span style="color: #000000;">amt</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">weight</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Total value: %f\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">worth</span><span style="color: #0000FF;">})</span>
<!--
atom weight = 15, worth = 0
for i=1 to length(tags) do
object {desc,wi,price} = meats[tags[i]]
atom amt = min(wi,weight)
printf(1,"%3.1fkg %s %s\n",{amt,iff(amt=wi?"(all the)":"of"),desc})
worth += (amt/wi)*price
weight -= amt
if weight=0 then exit end if
end for
printf(1,"Total value: %f\n",{worth})