56 lines
1.9 KiB
Markdown
56 lines
1.9 KiB
Markdown
---
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id: 5900f3b41000cf542c50fec7
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challengeType: 5
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title: 'Problem 72: Counting fractions'
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videoUrl: ''
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localeTitle: 问题72：计算分数
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---
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## Description
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<section id="description">考虑分数，n / d，其中n和d是正整数。如果是<d 1="" 2="" 3="" 4="" 5="" 6="" 7="" 8="" 21="" and="" hcf(n,d)="1," it="" is="" called="" a="" reduced="" proper="" fraction.="" if="" we="" list="" the="" set="" of="" fractions="" for="" d="" ≤="" in="" ascending="" order="" size,="" get:="" 8,="" 7,="" 6,="" 5,="" 4,="" 3,="" 2,="" can="" be="" seen="" that="" there="" are="" elements="" this="" set.="" how="" many="" would="" contained="" 1,000,000?="" <="" section=""><h2>说明</h2><section id="instructions"></section><h2>测试</h2><section id="tests"><pre> <code class="language-yml">tests: - text: <code>euler72()</code> should return 303963552391. testString: 'assert.strictEqual(euler72(), 303963552391, "<code>euler72()</code> should return 303963552391.");'</code> </pre></section><h2>挑战种子</h2><section id="challengeSeed"><div id="js-seed"><pre> <code class="language-js">function euler72() { // Good luck! return true; } euler72();</code> </pre></div></section><h2>解</h2><section id="solution"><pre> <code class="language-js">// solution required</code> </pre></section></d></section>
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## Instructions
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<section id="instructions">
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</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>euler72()</code>应该返回303963552391。
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testString: 'assert.strictEqual(euler72(), 303963552391, "<code>euler72()</code> should return 303963552391.");'
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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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function euler72() {
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// Good luck!
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return true;
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}
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euler72();
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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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