freeCodeCamp/problem-15-lattice-paths.md at e22adfcc6b2ae20faada58e37d160b866ef4181b

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Oliver Eyton-Williams dec409a4bd fix: s/localeTitle/title/g

2020-10-06 23:10:08 +05:30

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id, challengeType, videoUrl, title

id	challengeType	videoUrl	title
5900f37b1000cf542c50fe8e	5		问题15：格子路径

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。

通过给定的gridSize有多少这样的路由？

Instructions

Tests

tests:
  - text: <code>latticePaths(4)</code>应该返回70。
    testString: assert.strictEqual(latticePaths(4), 70);
  - text: <code>latticePaths(9)</code>应该返回48620。
    testString: assert.strictEqual(latticePaths(9), 48620);
  - text: <code>latticePaths(20)</code>应该返回137846528820。
    testString: assert.strictEqual(latticePaths(20), 137846528820);

Challenge Seed

function latticePaths(gridSize) {
  // Good luck!
  return true;
}

latticePaths(4);

Solution

// solution required

/section>

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Description

Instructions

Tests

Challenge Seed

Solution

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