56 lines
1.1 KiB
Markdown
56 lines
1.1 KiB
Markdown
|
---
|
|||
|
|
id: 5900f4f91000cf542c51000c
|
|||
|
|
challengeType: 5
|
|||
|
|
title: 'Problem 397: Triangle on parabola'
|
|||
|
|
videoUrl: ''
|
|||
|
|
localeTitle: 问题397：抛物线上的三角形
|
|||
|
|
---
|
|||
|
|
|
|||
|
|
## Description
|
|||
|
|
<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>
|
|||
|
|
|
|||
|
|
## Instructions
|
|||
|
|
<section id="instructions">
|
|||
|
|
</section>
|
|||
|
|
|
|||
|
|
## Tests
|
|||
|
|
<section id='tests'>
|
|||
|
|
|
|||
|
|
```yml
|
|||
|
|
tests:
|
|||
|
|
- text: <code>euler397()</code>应该返回141630459461893730。
|
|||
|
|
testString: 'assert.strictEqual(euler397(), 141630459461893730, "<code>euler397()</code> should return 141630459461893730.");'
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
</section>
|
|||
|
|
|
|||
|
|
## Challenge Seed
|
|||
|
|
<section id='challengeSeed'>
|
|||
|
|
|
|||
|
|
<div id='js-seed'>
|
|||
|
|
|
|||
|
|
```js
|
|||
|
|
function euler397() {
|
|||
|
|
// Good luck!
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
euler397();
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</section>
|
|||
|
|
|
|||
|
|
## Solution
|
|||
|
|
<section id='solution'>
|
|||
|
|
|
|||
|
|
```js
|
|||
|
|
// solution required
|
|||
|
|
```
|
|||
|
|
</section>
|