/********************
Nikita Dua
Comp Sci A p3
Array List Lab
*********************/

import java.util.ArrayList;
public class ArrayListLab
{
   //replaces each digit, k, in array with k times it
   public static void scaleByK(ArrayList<Integer> arr)
   {
      int counter=0;//keep track of #runs of for loop
      ArrayList<Integer> holder = new ArrayList<Integer>();//blank arraylist to add values to
      //for loop to remove digits with values less than or equal to 0
      for(int i=0; i<arr.size(); i++)
      {
         if(arr.get(i)<=0)
           arr.remove(arr.get(i));
      }
      for(int i=0; i<arr.size(); i++)//for loop that adds digits to blank arraylist
      {
         for(int x=1; x<= arr.get(i); x++)
         {
            holder.add(counter, arr.get(i));
         }
         counter=counter+arr.get(i);//keeps track of #runs of for loop
      }
      System.out.println(holder);
   }

   //returns arraylist which contains alternating values of both arraylists its passed
   public static void interleave(ArrayList<Integer> a1, ArrayList<Integer> a2)
   {
      ArrayList<Integer> totalArr = new ArrayList<Integer>();//blank array to add values to
      if(a1.size() == a2.size())//forms arraylist if of equal length
      {
         for(int i=0; i< a1.size(); i++)
         {
            totalArr.add(a1.get(i));
            totalArr.add(a2.get(i));
         }
      }
      else//forms arraylist if of unequal lengths
      {
         if(a2.size()> a1.size())//if a2 is bigger length
         {
            for(int x=0; x<a1.size(); x++)//adds alternating values up untill have unequal length
            {
               totalArr.add(a1.get(x));
               totalArr.add(a2.get(x));
            }
            for(int y=a1.size(); y<a2.size(); y++)//adds leftover values of unequal length
            {
               totalArr.add(a2.get(y));
            }

         }
         else//if a1 is bigger size
         {
            for(int x=0; x<a2.size(); x++)//adds alternating up to equal value
            {
               totalArr.add(a1.get(x));
               totalArr.add(a2.get(x));
            }
            for(int y=a2.size(); y<a1.size(); y++)//adds leftover values(unequal part)
            {
               totalArr.add(a1.get(y));
            }

         }
      }
      System.out.println(totalArr);//prints out final arraylist
   }
}