/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void foo(List<List<Integer>> param) {
		System.out.println(param.toString());
	}
 
	public static void main (String[] args) throws java.lang.Exception
	{
		List<List<Integer>> bla = new ArrayList<>();
		bla.add(new ArrayList<Integer>());
		bla.get(0).add(2);
		foo(bla);
	}
}

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