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freeCodeCamp/curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-324-building-a-tower.md
Oliver Eyton-Williams ee1e8abd87 feat(curriculum): restore seed + solution to Chinese (#40683)
* feat(tools): add seed/solution restore script

* chore(curriculum): remove empty sections' markers

* chore(curriculum): add seed + solution to Chinese

* chore: remove old formatter

* fix: update getChallenges

parse translated challenges separately, without reference to the source

* chore(curriculum): add dashedName to English

* chore(curriculum): add dashedName to Chinese

* refactor: remove unused challenge property 'name'

* fix: relax dashedName requirement

* fix: stray tag

Remove stray `pre` tag from challenge file.

Signed-off-by: nhcarrigan <nhcarrigan@gmail.com>

Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
2021-01-12 19:31:00 -07:00

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---
id: 5900f4b11000cf542c50ffc3
title: 'Problem 324: Building a tower'
challengeType: 5
forumTopicId: 301981
dashedName: problem-324-building-a-tower
---
# --description--
Let f(n) represent the number of ways one can fill a 3×3×n tower with blocks of 2×1×1. You're allowed to rotate the blocks in any way you like; however, rotations, reflections etc of the tower itself are counted as distinct.
For example (with q = 100000007) :f(2) = 229,f(4) = 117805,f(10) mod q = 96149360,f(103) mod q = 24806056,f(106) mod q = 30808124.
Find f(1010000) mod 100000007.
# --hints--
`euler324()` should return 96972774.
```js
assert.strictEqual(euler324(), 96972774);
```
# --seed--
## --seed-contents--
```js
function euler324() {
return true;
}
euler324();
```
# --solutions--
```js
// solution required
```