special input in C,C++.In a line,there's a first integer m and in that line m integers folow

I'm new in problem solving.But i'm realizing i'm getting a Smack in online judges because i dont take input correctly and dont output the way the problem is asking. say, The input is like first line ll consist a integer p,and p line follows. in each line the first integer m and and m integers follow separated by space. Ex.

4 2 4 6 1 2 5 1 3 4 6 3 3 2 9

How ll I take this input ..I ve done this but in a stupid way by doing a large array.. What is the efficient way or most possibly good way to take such inputs. Thanks :-)