2018-10-10 18:03:03 -04:00
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---
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id: 5900f4151000cf542c50ff28
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challengeType: 5
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title: 'Problem 169: Exploring the number of different ways a number can be expressed as a sum of powers of 2'
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videoUrl: ''
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localeTitle: 问题169：探索数字可以表示为2的幂之和的不同方式的数量
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---
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## Description
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<section id="description">将f（0）= 1和f（n）定义为不同方式的数量n可以表示为2的整数幂之和，使用每个幂不超过两次。例如，f（10）= 5因为有五种不同的表达方式10：1 + 1 + 8 1 + 1 + 4 + 41 + 1 + 2 + 2 + 4 2 + 4 + 4 2 + 8什么是f （1025）？ </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>euler169()</code>应该返回178653872807。
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2020-02-18 01:40:55 +09:00
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testString: assert.strictEqual(euler169(), 178653872807);
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2018-10-10 18:03:03 -04:00
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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 euler169() {
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// Good luck!
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return true;
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}
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euler169();
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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 17:24:35 +02:00
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/section>
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