60 lines
1.7 KiB
Markdown
60 lines
1.7 KiB
Markdown
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---
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id: 5900f37f1000cf542c50fe92
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challengeType: 5
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title: 'Problem 19: Counting Sundays'
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videoUrl: ''
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localeTitle: 问题19：计算星期日
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---
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## Description
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<section id="description">您将获得以下信息，但您可能更愿意为自己做一些研究。 <ul><li> 1900年1月1日是星期一。 </li><li>九月是三十天<br>四月，六月和十一月。 <br>其余的都有三十一个， <br>仅拯救二月， <br>其中有二十八，风雨无阻。 <br>在闰年，二十九岁。 </li><li>闰年发生在任何一年，可被4整除，但除非可被400整除，否则不会在一个世纪上。 </li>在二十世纪的第一个月（1901年1月1日至2000年12月31日），有多少个星期日下降？ </ul></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>countingSundays(1943, 1946)</code>应该返回6。'
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testString: 'assert.strictEqual(countingSundays(1943, 1946), 6, "<code>countingSundays(1943, 1946)</code> should return 6.");'
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- text: '<code>countingSundays(1995, 2000)</code>应该返回9。'
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testString: 'assert.strictEqual(countingSundays(1995, 2000), 9, "<code>countingSundays(1995, 2000)</code> should return 9.");'
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- text: '<code>countingSundays(1901, 2000)</code>应该返回171。'
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testString: 'assert.strictEqual(countingSundays(1901, 2000), 171, "<code>countingSundays(1901, 2000)</code> should return 171.");'
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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 countingSundays(firstYear, lastYear) {
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// Good luck!
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return true;
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}
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countingSundays(1943, 1946);
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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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