56 lines
1.1 KiB
Markdown
56 lines
1.1 KiB
Markdown
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---
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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, "<code>euler397()</code> should return 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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