70 lines
2.6 KiB
Markdown
70 lines
2.6 KiB
Markdown
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---
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title: 24 game
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id: 5951e88f64ebf159166a1176
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challengeType: 5
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videoUrl: ''
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localeTitle: 24场比赛
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---
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## Description
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<section id="description"><p>实现一个以四位数字串为参数的函数，每个数字从1──►9（含），允许重复，并返回一个算术表达式，其值为24。如果不存在这样的解，则返回“没有解决方案。“ </p><p>规则： </p>只允许以下运算符/函数：乘法，除法，加法，减法除法应使用浮点或有理算术等来保留余数。不允许从提供的数字中形成多位数字。 （所以当给出1,2,2和1时，12 + 12的答案是错误的）。给定的数字顺序不必保留。 <p>示例输入： </p> <code>solve24("4878");</code> <code>solve24("1234");</code> <code>solve24("6789");</code> <code>solve24("1127");</code> <p>示例输出（字符串）： </p> <code>(7-8/8)*4</code> <code>3*1*4*2</code> <code>(6*8)/(9-7)</code> <code>(1+7)*(2+1)</code> </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>solve24</code>是一个函数。
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testString: 'assert(typeof solve24 === "function", "<code>solve24</code> is a function.");'
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- text: <code>solve24("4878")</code>应返回<code>(7-8/8)*4</code>或<code>4*(7-8/8)</code>
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testString: 'assert(include(answers[0], solve24(testCases[0])), "<code>solve24("4878")</code> should return <code>(7-8/8)*4</code> or <code>4*(7-8/8)</code>");'
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- text: <code>solve24("1234")</code>应返回<code>1*2*3*4</code>任何排列
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testString: 'assert(include(answers[1], solve24(testCases[1])), "<code>solve24("1234")</code> should return any arrangement of <code>1*2*3*4</code>");'
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- text: <code>solve24("6789")</code>应返回<code>(6*8)/(9-7)</code>或<code>(8*6)/(9-7)</code>
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testString: 'assert(include(answers[2], solve24(testCases[2])), "<code>solve24("6789")</code> should return <code>(6*8)/(9-7)</code> or <code>(8*6)/(9-7)</code>");'
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- text: <code>solve24("1127")</code>应该返回<code>(1+7)*(1*2)</code>的排列
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testString: 'assert(include(answers[3], solve24(testCases[3])), "<code>solve24("1127")</code> should return a permutation of <code>(1+7)*(1*2)</code>");'
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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 solve24 (numStr) {
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// Good luck!
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return true;
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}
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```
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</div>
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### After Test
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<div id='js-teardown'>
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```js
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console.info('after the test');
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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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</section>
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