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Update description.md

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Ankur Sundara 2017-03-10 19:19:43 -06:00 committed by GitHub
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@ -4,11 +4,11 @@ Input: the integer, N (1<=N<=2^1024)
Output: the number of ways you can place red-colored books and blue-colored books onto the bookshelf. Since this number might be really big, output it mod 10^9+7. Output: the number of ways you can place red-colored books and blue-colored books onto the bookshelf. Since this number might be really big, output it mod 10^9+7.
Ex: N=3 Example:
Input: 3 Input: 3
Your valid bookshelf layouts are:
```
BB BB
BB BB
@ -29,5 +29,6 @@ BR
BR BR
RB RB
```
Therefore,
Output: 7 Output: 7