I'm stuck at a problem. I want someone to help me with how to proceed further?

I'm working on a problem in C++. Its main idea is as follows.

I have a buffer(vector in my case) in which each item holds 4 values.

start line
end line
start index
end index
I'll receive a line of data. Each line is capable of holding 4096 float values. my program has 4096 such lines spread over 360...