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@ -2,10 +2,10 @@ Your librarian has a 2-row bookshelf that can contain N books in each row. She w
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Input: the integer, N (1<=N<=2^1024)
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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.
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Output: the number of ways you can place red-colored books and blue-colored books onto a N-column bookshelf. Since this number might be really big, output it mod 10^9+7.
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Example:
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Input: 3
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Input: 2
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Your valid bookshelf layouts are:
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```
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