Sequencing of modules

Sir ,could you please tell me the sequence which I should follow while doing this course as , in this problems vectors are used but they are on the later module.
PLEASE HELP ME!
So that it would be easy for me to conceive things in a better way.

which course you have purchased?

c++ mastercourse | Launchpad

i think everything is in sequence

in which video vector is used?

if in any video vector is used plz ignore it for now and come back later on

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