60 lines
1.4 KiB
Markdown
60 lines
1.4 KiB
Markdown
---
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id: 5900f37b1000cf542c50fe8e
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challengeType: 5
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title: 'Problem 15: Lattice paths'
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videoUrl: ''
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localeTitle: 问题15：格子路径
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---
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## Description
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<section id="description">从2×2网格的左上角开始，只能向右和向下移动，右下角有6条路线。 <img class="img-responsive center-block" alt="6 2乘2网格的图表显示了右下角的所有路线" src="https://cdn-media-1.freecodecamp.org/imgr/1Atixoj.gif"><p>通过给定的<code>gridSize</code>有多少这样的路由？ </p></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>latticePaths(4)</code>应该返回70。
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testString: 'assert.strictEqual(latticePaths(4), 70, "<code>latticePaths(4)</code> should return 70.");'
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- text: <code>latticePaths(9)</code>应该返回48620。
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testString: 'assert.strictEqual(latticePaths(9), 48620, "<code>latticePaths(9)</code> should return 48620.");'
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- text: <code>latticePaths(20)</code>应该返回137846528820。
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testString: 'assert.strictEqual(latticePaths(20), 137846528820, "<code>latticePaths(20)</code> should return 137846528820.");'
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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 latticePaths(gridSize) {
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// Good luck!
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return true;
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}
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latticePaths(4);
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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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