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What is the difference between the definitions: 1) vector<Vec4i> lines and 2) Vec4i l

I found both these in the same code here. I am wondering if there is any difference between the both? If not why use the first format which is longer?

What is the difference between the definitions: definitions:

1) vector<Vec4i> lines and and

2) Vec4i l

I found both these in the same code here. I am wondering if there is any difference between the both? If not why use the first format which is longer?