Transferring vector data to an array

I'm reading an obj file to get its vertex and index data, but the file I was reading didn't say how many vertices or indices, so I decided to use a vector to read it and then transfer the data to an array. The problem is that I can't do this.

Code:

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UINT indices[vector.size()];

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How can I get around that?

Why do you need the array when you already have a vector?