freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-440-gcd-and-tiling.md

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---
id: 5900f5241000cf542c510037
challengeType: 5
videoUrl: ''
localeTitle: 问题440GCD和平铺
---
## Description
<section id="description">
我们要完全平铺一块长度为n且高度为1的板上面有1×2块或1×1块上面有一个十进制数字
例如以下是铺砌长度为n = 8的板的一些方法
令Tn是如上所述的平铺长度为n的板的方式的数量。
例如T1= 10且T2= 101。
令SL为1≤abc≤L的三次和∑abc gcdTcaTcb
例如:
S2= 10444
S3= 1292115238446807016106539989
S4模数987898789 = 670616280。
找出S2000mod 987898898。
</section>
## Instructions
<section id="instructions">
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>euler440()</code>应该返回970746056。
testString: assert.strictEqual(euler440(), 970746056);
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function euler440() {
// Good luck!
return true;
}
euler440();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
/section>