2018-10-10 22:03:03 +00:00
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---
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id: 5900f4a31000cf542c50ffb6
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challengeType: 5
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videoUrl: ''
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2020-10-01 15:54:21 +00:00
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title: 问题311:双斜积分四边形
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2018-10-10 22:03:03 +00:00
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---
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## Description
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2020-02-17 16:40:55 +00:00
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<section id="description">
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ABCD是凸的整数边四边形,其1≤AB <BC <CD <AD。
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BD具有整数长度。 O是BD的中点。 AO,您有整数长度。
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如果AO = CO≤BO = DO,我们将ABCD称为双斜积分四边形。
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例如,以下四边形是双斜积分四边形:
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AB = 19,BC = 29,CD = 37,AD = 43,BD = 48和AO = CO = 23。
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令B(N)为满足AB2 + BC2 + CD2 + AD2≤N的不同双斜积分四边形ABCD的数量。
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我们可以验证B(10000)= 49和B(1 000 000)= 38239。
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求B(10000000000000)。
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</section>
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2018-10-10 22:03:03 +00:00
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## Instructions
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2020-02-17 16:40:55 +00:00
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<section id="instructions">
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</section>
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2018-10-10 22:03:03 +00:00
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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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2020-02-17 16:40:55 +00:00
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- text: <code>euler311()</code>应该返回2466018557。
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testString: assert.strictEqual(euler311(), 2466018557);
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2018-10-10 22:03:03 +00:00
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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 euler311() {
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// Good luck!
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return true;
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}
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euler311();
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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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2020-08-13 15:24:35 +00:00
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/section>
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