2018-10-10 22:03:03 +00:00
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id: 5900f4f11000cf542c510002
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2020-12-16 07:37:30 +00:00
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title: 问题388:不同的线条
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2018-10-10 22:03:03 +00:00
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challengeType: 5
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videoUrl: ''
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2021-01-13 02:31:00 +00:00
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dashedName: problem-388-distinct-lines
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2018-10-10 22:03:03 +00:00
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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考虑所有格点(a,b,c),其中0≤a,b,c≤N。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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从原点O(0,0,0)开始,所有线都被绘制到其他格点。设D(N)是不同的这种线的数量。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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您被给予D(1 000 000)= 831909254469114121。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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找到D(1010)。将前9位数字后跟最后9位数字作为答案。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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# --hints--
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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`euler388()`应该返回831907372805130000。
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2018-10-10 22:03:03 +00:00
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```js
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2020-12-16 07:37:30 +00:00
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assert.strictEqual(euler388(), 831907372805130000);
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2018-10-10 22:03:03 +00:00
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```
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2021-01-13 02:31:00 +00:00
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# --seed--
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## --seed-contents--
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```js
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function euler388() {
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return true;
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}
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euler388();
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```
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2020-08-13 15:24:35 +00:00
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2021-01-13 02:31:00 +00:00
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```js
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// solution required
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```
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