72 lines
14 KiB
Markdown
72 lines
14 KiB
Markdown
---
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id: 5900f3d91000cf542c50feea
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title: 'Problema 107: Rete minimale'
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challengeType: 1
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forumTopicId: 301731
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dashedName: problem-107-minimal-network
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---
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# --description--
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La seguente rete non orientata è costituita da sette vertici e dodici archi con un peso totale di 243.
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<img class="img-responsive center-block" alt="Rete con sette vertici e dodici archi" src="https://cdn.freecodecamp.org/curriculum/project-euler/minimal-network-1.png" style="background-color: white; padding: 10px;" />
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La stessa rete può essere rappresentata dalla matrice sottostante.
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| | A | B | C | D | E | F | G |
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| - | -- | -- | -- | -- | -- | -- | -- |
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| A | - | 16 | 12 | 21 | - | - | - |
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| B | 16 | - | - | 17 | 20 | - | - |
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| C | 12 | - | - | 28 | - | 31 | - |
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| D | 21 | 17 | 28 | - | 18 | 19 | 23 |
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| E | - | 20 | - | 18 | - | - | 11 |
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| F | - | - | 31 | 19 | - | - | 27 |
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| G | - | - | - | 23 | 11 | 27 | - |
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Tuttavia, è possibile ottimizzare la rete rimuovendo alcuni archi e garantire che tutti i punti della rete rimangano connessi. La rete che raggiunge il massimo risparmio è mostrata sotto. Ha un peso di 93, che rappresenta un risparmio di 243 − 93 = 150 rispetto alla rete originale.
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<img class="img-responsive center-block" alt="Rete con sette vertici e sei archi rimanenti: AB, BD, CA, DE, DF, EG" src="https://cdn.freecodecamp.org/curriculum/project-euler/minimal-network-2.png" style="background-color: white; padding: 10px;" />
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Utilizzando `network`, un array 2D che rappresenta la rete in forma di matrice, trova il massimo risparmio che può essere ottenuto rimuovendo gli archi ridondanti, garantendo al contempo che la rete rimanga connessa. I vertici che non hanno connessione saranno rappresentati con `-1`.
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# --hints--
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`minimalNetwork(testNetwork)` dovrebbe restituire `259679`.
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```js
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assert.strictEqual(minimalNetwork(_testNetwork), 259679);
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```
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# --seed--
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## --after-user-code--
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```js
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const _testNetwork = [
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[-1,-1,-1,427,668,495,377,678,-1,177,-1,-1,870,-1,869,624,300,609,131,-1,251,-1,-1,-1,856,221,514,-1,591,762,182,56,-1,884,412,273,636,-1,-1,774],[-1,-1,262,-1,-1,508,472,799,-1,956,578,363,940,143,-1,162,122,910,-1,729,802,941,922,573,531,539,667,607,-1,920,-1,-1,315,649,937,-1,185,102,636,289],[-1,262,-1,-1,926,-1,958,158,647,47,621,264,81,-1,402,813,649,386,252,391,264,637,349,-1,-1,-1,108,-1,727,225,578,699,-1,898,294,-1,575,168,432,833],[427,-1,-1,-1,366,-1,-1,635,-1,32,962,468,893,854,718,427,448,916,258,-1,760,909,529,311,404,-1,-1,588,680,875,-1,615,-1,409,758,221,-1,-1,76,257],[668,-1,926,366,-1,-1,-1,250,268,-1,503,944,-1,677,-1,727,793,457,981,191,-1,-1,-1,351,969,925,987,328,282,589,-1,873,477,-1,-1,19,450,-1,-1,-1],[495,508,-1,-1,-1,-1,-1,765,711,819,305,302,926,-1,-1,582,-1,861,-1,683,293,-1,-1,66,-1,27,-1,-1,290,-1,786,-1,554,817,33,-1,54,506,386,381],[377,472,958,-1,-1,-1,-1,-1,-1,120,42,-1,134,219,457,639,538,374,-1,-1,-1,966,-1,-1,-1,-1,-1,449,120,797,358,232,550,-1,305,997,662,744,686,239],[678,799,158,635,250,765,-1,-1,-1,35,-1,106,385,652,160,-1,890,812,605,953,-1,-1,-1,79,-1,712,613,312,452,-1,978,900,-1,901,-1,-1,225,533,770,722],[-1,-1,647,-1,268,711,-1,-1,-1,283,-1,172,-1,663,236,36,403,286,986,-1,-1,810,761,574,53,793,-1,-1,777,330,936,883,286,-1,174,-1,-1,-1,828,711],[177,956,47,32,-1,819,120,35,283,-1,50,-1,565,36,767,684,344,489,565,-1,-1,103,810,463,733,665,494,644,863,25,385,-1,342,470,-1,-1,-1,730,582,468],[-1,578,621,962,503,305,42,-1,-1,50,-1,155,519,-1,-1,256,990,801,154,53,474,650,402,-1,-1,-1,966,-1,-1,406,989,772,932,7,-1,823,391,-1,-1,933],[-1,363,264,468,944,302,-1,106,172,-1,155,-1,-1,-1,380,438,-1,41,266,-1,-1,104,867,609,-1,270,861,-1,-1,165,-1,675,250,686,995,366,191,-1,433,-1],[870,940,81,893,-1,926,134,385,-1,565,519,-1,-1,313,851,-1,-1,-1,248,220,-1,826,359,829,-1,234,198,145,409,68,359,-1,814,218,186,-1,-1,929,203,-1],[-1,143,-1,854,677,-1,219,652,663,36,-1,-1,313,-1,132,-1,433,598,-1,-1,168,870,-1,-1,-1,128,437,-1,383,364,966,227,-1,-1,807,993,-1,-1,526,17],[869,-1,402,718,-1,-1,457,160,236,767,-1,380,851,132,-1,-1,596,903,613,730,-1,261,-1,142,379,885,89,-1,848,258,112,-1,900,-1,-1,818,639,268,600,-1],[624,162,813,427,727,582,639,-1,36,684,256,438,-1,-1,-1,-1,539,379,664,561,542,-1,999,585,-1,-1,321,398,-1,-1,950,68,193,-1,697,-1,390,588,848,-1],[300,122,649,448,793,-1,538,890,403,344,990,-1,-1,433,596,539,-1,-1,73,-1,318,-1,-1,500,-1,968,-1,291,-1,-1,765,196,504,757,-1,542,-1,395,227,148],[609,910,386,916,457,861,374,812,286,489,801,41,-1,598,903,379,-1,-1,-1,946,136,399,-1,941,707,156,757,258,251,-1,807,-1,-1,-1,461,501,-1,-1,616,-1],[131,-1,252,258,981,-1,-1,605,986,565,154,266,248,-1,613,664,73,-1,-1,686,-1,-1,575,627,817,282,-1,698,398,222,-1,649,-1,-1,-1,-1,-1,654,-1,-1],[-1,729,391,-1,191,683,-1,953,-1,-1,53,-1,220,-1,730,561,-1,946,686,-1,-1,389,729,553,304,703,455,857,260,-1,991,182,351,477,867,-1,-1,889,217,853],[251,802,264,760,-1,293,-1,-1,-1,-1,474,-1,-1,168,-1,542,318,136,-1,-1,-1,-1,392,-1,-1,-1,267,407,27,651,80,927,-1,974,977,-1,-1,457,117,-1],[-1,941,637,909,-1,-1,966,-1,810,103,650,104,826,870,261,-1,-1,399,-1,389,-1,-1,-1,202,-1,-1,-1,-1,867,140,403,962,785,-1,511,-1,1,-1,707,-1],[-1,922,349,529,-1,-1,-1,-1,761,810,402,867,359,-1,-1,999,-1,-1,575,729,392,-1,-1,388,939,-1,959,-1,83,463,361,-1,-1,512,931,-1,224,690,369,-1],[-1,573,-1,311,351,66,-1,79,574,463,-1,609,829,-1,142,585,500,941,627,553,-1,202,388,-1,164,829,-1,620,523,639,936,-1,-1,490,-1,695,-1,505,109,-1],[856,531,-1,404,969,-1,-1,-1,53,733,-1,-1,-1,-1,379,-1,-1,707,817,304,-1,-1,939,164,-1,-1,616,716,728,-1,889,349,-1,963,150,447,-1,292,586,264],[221,539,-1,-1,925,27,-1,712,793,665,-1,270,234,128,885,-1,968,156,282,703,-1,-1,-1,829,-1,-1,-1,822,-1,-1,-1,736,576,-1,697,946,443,-1,205,194],[514,667,108,-1,987,-1,-1,613,-1,494,966,861,198,437,89,321,-1,757,-1,455,267,-1,959,-1,616,-1,-1,-1,349,156,339,-1,102,790,359,-1,439,938,809,260],[-1,607,-1,588,328,-1,449,312,-1,644,-1,-1,145,-1,-1,398,291,258,698,857,407,-1,-1,620,716,822,-1,-1,293,486,943,-1,779,-1,6,880,116,775,-1,947],[591,-1,727,680,282,290,120,452,777,863,-1,-1,409,383,848,-1,-1,251,398,260,27,867,83,523,728,-1,349,293,-1,212,684,505,341,384,9,992,507,48,-1,-1],[762,920,225,875,589,-1,797,-1,330,25,406,165,68,364,258,-1,-1,-1,222,-1,651,140,463,639,-1,-1,156,486,212,-1,-1,349,723,-1,-1,186,-1,36,240,752],[182,-1,578,-1,-1,786,358,978,936,385,989,-1,359,966,112,950,765,807,-1,991,80,403,361,936,889,-1,339,943,684,-1,-1,965,302,676,725,-1,327,134,-1,147],[56,-1,699,615,873,-1,232,900,883,-1,772,675,-1,227,-1,68,196,-1,649,182,927,962,-1,-1,349,736,-1,-1,505,349,965,-1,474,178,833,-1,-1,555,853,-1],[-1,315,-1,-1,477,554,550,-1,286,342,932,250,814,-1,900,193,504,-1,-1,351,-1,785,-1,-1,-1,576,102,779,341,723,302,474,-1,689,-1,-1,-1,451,-1,-1],[884,649,898,409,-1,817,-1,901,-1,470,7,686,218,-1,-1,-1,757,-1,-1,477,974,-1,512,490,963,-1,790,-1,384,-1,676,178,689,-1,245,596,445,-1,-1,343],[412,937,294,758,-1,33,305,-1,174,-1,-1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];
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```
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## --seed-contents--
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```js
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function minimalNetwork(network) {
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return true;
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}
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const testNetwork = [
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[-1,-1,-1,427,668,495,377,678,-1,177,-1,-1,870,-1,869,624,300,609,131,-1,251,-1,-1,-1,856,221,514,-1,591,762,182,56,-1,884,412,273,636,-1,-1,774],[-1,-1,262,-1,-1,508,472,799,-1,956,578,363,940,143,-1,162,122,910,-1,729,802,941,922,573,531,539,667,607,-1,920,-1,-1,315,649,937,-1,185,102,636,289],[-1,262,-1,-1,926,-1,958,158,647,47,621,264,81,-1,402,813,649,386,252,391,264,637,349,-1,-1,-1,108,-1,727,225,578,699,-1,898,294,-1,575,168,432,833],[427,-1,-1,-1,366,-1,-1,635,-1,32,962,468,893,854,718,427,448,916,258,-1,760,909,529,311,404,-1,-1,588,680,875,-1,615,-1,409,758,221,-1,-1,76,257],[668,-1,926,366,-1,-1,-1,250,268,-1,503,944,-1,677,-1,727,793,457,981,191,-1,-1,-1,351,969,925,987,328,282,589,-1,873,477,-1,-1,19,450,-1,-1,-1],[495,508,-1,-1,-1,-1,-1,765,711,819,305,302,926,-1,-1,582,-1,861,-1,683,293,-1,-1,66,-1,27,-1,-1,290,-1,786,-1,554,817,33,-1,54,506,386,381],[377,472,958,-1,-1,-1,-1,-1,-1,120,42,-1,134,219,457,639,538,374,-1,-1,-1,966,-1,-1,-1,-1,-1,449,120,797,358,232,550,-1,305,997,662,744,686,239],[678,799,158,635,250,765,-1,-1,-1,35,-1,106,385,652,160,-1,890,812,605,953,-1,-1,-1,79,-1,712,613,312,452,-1,978,900,-1,901,-1,-1,225,533,770,722],[-1,-1,647,-1,268,711,-1,-1,-1,283,-1,172,-1,663,236,36,403,286,986,-1,-1,810,761,574,53,793,-1,-1,777,330,936,883,286,-1,174,-1,-1,-1,828,711],[177,956,47,32,-1,819,120,35,283,-1,50,-1,565,36,767,684,344,489,565,-1,-1,103,810,463,733,665,494,644,863,25,385,-1,342,470,-1,-1,-1,730,582,468],[-1,578,621,962,503,305,42,-1,-1,50,-1,155,519,-1,-1,256,990,801,154,53,474,650,402,-1,-1,-1,966,-1,-1,406,989,772,932,7,-1,823,391,-1,-1,933],[-1,363,264,468,944,302,-1,106,172,-1,155,-1,-1,-1,380,438,-1,41,266,-1,-1,104,867,609,-1,270,861,-1,-1,165,-1,675,250,686,995,366,191,-1,433,-1],[870,940,81,893,-1,926,134,385,-1,565,519,-1,-1,313,851,-1,-1,-1,248,220,-1,826,359,829,-1,234,198,145,409,68,359,-1,814,218,186,-1,-1,929,203,-1],[-1,143,-1,854,677,-1,219,652,663,36,-1,-1,313,-1,132,-1,433,598,-1,-1,168,870,-1,-1,-1,128,437,-1,383,364,966,227,-1,-1,807,993,-1,-1,526,17],[869,-1,402,718,-1,-1,457,160,236,767,-1,380,851,132,-1,-1,596,903,613,730,-1,261,-1,142,379,885,89,-1,848,258,112,-1,900,-1,-1,818,639,268,600,-1],[624,162,813,427,727,582,639,-1,36,684,256,438,-1,-1,-1,-1,539,379,664,561,542,-1,999,585,-1,-1,321,398,-1,-1,950,68,193,-1,697,-1,390,588,848,-1],[300,122,649,448,793,-1,538,890,403,344,990,-1,-1,433,596,539,-1,-1,73,-1,318,-1,-1,500,-1,968,-1,291,-1,-1,765,196,504,757,-1,542,-1,395,227,148],[609,910,386,916,457,861,374,812,286,489,801,41,-1,598,903,379,-1,-1,-1,946,136,399,-1,941,707,156,757,258,251,-1,807,-1,-1,-1,461,501,-1,-1,616,-1],[131,-1,252,258,981,-1,-1,605,986,565,154,266,248,-1,613,664,73,-1,-1,686,-1,-1,575,627,817,282,-1,698,398,222,-1,649,-1,-1,-1,-1,-1,654,-1,-1],[-1,729,391,-1,191,683,-1,953,-1,-1,53,-1,220,-1,730,561,-1,946,686,-1,-1,389,729,553,304,703,455,857,260,-1,991,182,351,477,867,-1,-1,889,217,853],[251,802,264,760,-1,293,-1,-1,-1,-1,474,-1,-1,168,-1,542,318,136,-1,-1,-1,-1,392,-1,-1,-1,267,407,27,651,80,927,-1,974,977,-1,-1,457,117,-1],[-1,941,637,909,-1,-1,966,-1,810,103,650,104,826,870,261,-1,-1,399,-1,389,-1,-1,-1,202,-1,-1,-1,-1,867,140,403,962,785,-1,511,-1,1,-1,707,-1],[-1,922,349,529,-1,-1,-1,-1,761,810,402,867,359,-1,-1,999,-1,-1,575,729,392,-1,-1,388,939,-1,959,-1,83,463,361,-1,-1,512,931,-1,224,690,369,-1],[-1,573,-1,311,351,66,-1,79,574,463,-1,609,829,-1,142,585,500,941,627,553,-1,202,388,-1,164,829,-1,620,523,639,936,-1,-1,490,-1,695,-1,505,109,-1],[856,531,-1,404,969,-1,-1,-1,53,733,-1,-1,-1,-1,379,-1,-1,707,817,304,-1,-1,939,164,-1,-1,616,716,728,-1,889,349,-1,963,150,447,-1,292,586,264],[221,539,-1,-1,925,27,-1,712,793,665,-1,270,234,128,885,-1,968,156,282,703,-1,-1,-1,829,-1,-1,-1,822,-1,-1,-1,736,576,-1,697,946,443,-1,205,194],[514,667,108,-1,987,-1,-1,613,-1,494,966,861,198,437,89,321,-1,757,-1,455,267,-1,959,-1,616,-1,-1,-1,349,156,339,-1,102,790,359,-1,439,938,809,260],[-1,607,-1,588,328,-1,449,312,-1,644,-1,-1,145,-1,-1,398,291,258,698,857,407,-1,-1,620,716,822,-1,-1,293,486,943,-1,779,-1,6,880,116,775,-1,947],[591,-1,727,680,282,290,120,452,777,863,-1,-1,409,383,848,-1,-1,251,398,260,27,867,83,523,728,-1,349,293,-1,212,684,505,341,384,9,992,507,48,-1,-1],[762,920,225,875,589,-1,797,-1,330,25,406,165,68,364,258,-1,-1,-1,222,-1,651,140,463,639,-1,-1,156,486,212,-1,-1,349,723,-1,-1,186,-1,36,240,752],[182,-1,578,-1,-1,786,358,978,936,385,989,-1,359,966,112,950,765,807,-1,991,80,403,361,936,889,-1,339,943,684,-1,-1,965,302,676,725,-1,327,134,-1,147],[56,-1,699,615,873,-1,232,900,883,-1,772,675,-1,227,-1,68,196,-1,649,182,927,962,-1,-1,349,736,-1,-1,505,349,965,-1,474,178,833,-1,-1,555,853,-1],[-1,315,-1,-1,477,554,550,-1,286,342,932,250,814,-1,900,193,504,-1,-1,351,-1,785,-1,-1,-1,576,102,779,341,723,302,474,-1,689,-1,-1,-1,451,-1,-1],[884,649,898,409,-1,817,-1,901,-1,470,7,686,218,-1,-1,-1,757,-1,-1,477,974,-1,512,490,963,-1,790,-1,384,-1,676,178,689,-1,245,596,445,-1,-1,343],[412,937,294,758,-1,33,305,-1,174,-1,-1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];
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minimalNetwork(testNetwork);
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```
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# --solutions--
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```js
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// solution required
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```
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