I would like to know how many element of each number is in array, i. e.:
`[2,2,3,6,1,1001,2]` should return 2 => 3, 3 => 1, 6 = >1, 1 => 1, 1001 => 1. But when I use additional array when I set `counted[2] = 3`, and `counted[1001] = 1` I create 1002 length array (in opposite to arrays in `PHP` I think...). How could I improve it? (of course I don't know how many element there will be in my input array)
Thanks in advice.