time, space complexity and O notation problem [duplicate]

Question

Possible Duplicate:
Plain English explanation of Big O

I can't find any sufficient help for learn or understand about O-notation, and how learn about time or space complexity. So please suggest me , where can I start this. Its really need to me, for now these time.So please give me solution quick. Thanks a lot in advance.

Answer 1

      

Answer 2

Best explanation of Big O I've ever seen:

What is a plain English explanation of "Big O" notation?