Interview Preparation Big O notation

Big O notation is a mathematical way of representing an approximate time required for an expression to complete by checking for its major dependencies.

For a example, f(n) = n^5 + n.

As we go on increasing the value of n the dependency on the second half equation on the right-hand side will reduce.

so, we can also say that f(n) = n^5 or complexity is O(n^5) for n equal to infinity.

Note: For comparison of big O complexity for different algorithms, refer following site: http://bigocheatsheet.com/