61460c8601
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57 lines
1.0 KiB
Markdown
57 lines
1.0 KiB
Markdown
---
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id: 5900f4f91000cf542c51000c
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challengeType: 5
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title: 'Problem 397: Triangle on parabola'
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videoUrl: ''
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localeTitle: 问题397：抛物线上的三角形
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---
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## Description
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<section id="description">在抛物线y = x2 / k上，选择三个点A（a，a2 / k），B（b，b2 / k）和C（c，c2 / k）。 <p>令F（K，X）为整数四元组（k，a，b，c）的数量，使得三角形ABC的至少一个角度为45度，其中1≤k≤K且-X≤a< b <c≤X。 </p><p>例如，F（1,10）= 41并且F（10,100）= 12492.找到F（106,109）。 </p></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>euler397()</code>应该返回141630459461893730。
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testString: assert.strictEqual(euler397(), 141630459461893730);
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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 euler397() {
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// Good luck!
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return true;
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}
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euler397();
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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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