57 lines
2.9 KiB
Markdown
57 lines
2.9 KiB
Markdown
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---
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id: 587d8256367417b2b2512c77
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title: Adjacency List
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challengeType: 1
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videoUrl: ''
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localeTitle: 邻接名单
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---
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## Description
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<section id="description">图表可以以不同方式表示。这里我们描述一种方法,称为<dfn>邻接列表</dfn> 。邻接列表本质上是项目符号列表,其中左侧是节点,右侧列出它所连接的所有其他节点。下面是邻接列表的表示。 <blockquote> Node1:Node2,Node3 <br> Node2:Node1 <br> Node3:Node1 </blockquote>以上是无向图,因为<code>Node1</code>连接到<code>Node2</code>和<code>Node3</code> ,并且该信息与<code>Node2</code>和<code>Node3</code>显示的连接一致。有向图的邻接列表意味着列表的每一行都显示方向。如果指示上述内容,那么<code>Node2: Node1</code>将意味着有向边缘从<code>Node2</code>指向<code>Node1</code> 。我们可以将上面的无向图表示为邻接列表,方法是将其放在JavaScript对象中。 <blockquote> var undirectedG = { <br>节点1:[“Node2”,“Node3”], <br> Node2:[“Node1”], <br> Node3:[“Node1”] <br> }; </blockquote>这也可以更简单地表示为一个数组,其中节点只有数字而不是字符串标签。 <blockquote> var undirectedGArr = [ <br> [1,2],#Node1 <br> [0],#Node2 <br> [0] #Node3 <br> ]。 </blockquote></section>
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## Instructions
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<section id="instructions">创建一个社交网络作为无向图,其中有4个节点/人名为<code>James</code> , <code>Jill</code> , <code>Jenny</code>和<code>Jeff</code> 。詹姆斯和杰夫,吉尔和珍妮以及杰夫和珍妮之间存在边缘/关系。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>undirectedAdjList</code>应该只包含四个节点。
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testString: 'assert(Object.keys(undirectedAdjList).length === 4, "<code>undirectedAdjList</code> should only contain four nodes.");'
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- text: <code>Jeff</code>和<code>James</code>之间应该有优势。
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testString: 'assert(undirectedAdjList.James.indexOf("Jeff") !== -1 && undirectedAdjList.Jeff.indexOf("James") !== -1, "There should be an edge between <code>Jeff</code> and <code>James</code>.");'
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- text: <code>Jill</code>和<code>Jenny</code>之间应该有一个优势。
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testString: 'assert(undirectedAdjList.Jill.indexOf("Jenny") !== -1 && undirectedAdjList.Jill.indexOf("Jenny") !== -1, "There should be an edge between <code>Jill</code> and <code>Jenny</code>.");'
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- text: <code>Jeff</code>和<code>Jenny</code>之间应该有优势。
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testString: 'assert(undirectedAdjList.Jeff.indexOf("Jenny") !== -1 && undirectedAdjList.Jenny.indexOf("Jeff") !== -1, "There should be an edge between <code>Jeff</code> and <code>Jenny</code>.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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var undirectedAdjList = {
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};
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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