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freeCodeCamp/curriculum/challenges/russian/08-coding-interview-prep/project-euler/problem-15-lattice-paths.russian.md
Ahmad Abdolsaheb d24778ceb8 fix: replace imgur URLs with s3 URLs for files with potential conflict (#36049)
* fix: replace imgur with s3 for files with potential conflict

(cherry picked from commit 4ec62c0e29a64b0288eade45fb510f25c622945a)

* fix/remote extra link

Co-Authored-By: Randell Dawson <5313213+RandellDawson@users.noreply.github.com>

* fix: revert change
2019-06-12 11:19:43 +03:00

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---
id: 5900f37b1000cf542c50fe8e
challengeType: 5
title: 'Problem 15: Lattice paths'
videoUrl: ''
localeTitle: 'Задача 15: Решетчатые пути'
---
## Description
<section id="description"> Начиная в левом верхнем углу сетки 2 × 2 и только имея возможность двигаться вправо и вниз, ровно 6 маршрутов в нижний правый угол. <img class="img-responsive center-block" alt="диаграмма 6 2 на 2 сетки, показывающая все маршруты в нижний правый угол" src="https://cdn-media-1.freecodecamp.org/imgr/1Atixoj.gif"><p> Сколько таких маршрутов существует через заданный <code>gridSize</code> ? </p></section>
## Instructions
<section id="instructions">
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>latticePaths(4)</code> должна вернуть 70.
testString: 'assert.strictEqual(latticePaths(4), 70, "<code>latticePaths(4)</code> should return 70.");'
- text: <code>latticePaths(9)</code> должна вернуть 48620.
testString: 'assert.strictEqual(latticePaths(9), 48620, "<code>latticePaths(9)</code> should return 48620.");'
- text: <code>latticePaths(20)</code> должна возвращать 137846528820.
testString: 'assert.strictEqual(latticePaths(20), 137846528820, "<code>latticePaths(20)</code> should return 137846528820.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function latticePaths(gridSize) {
// Good luck!
return true;
}
latticePaths(4);
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>