count occurance of given subarray in an array
// 1) Convert array to String, for eg. [1,2,3,4] => "1234".
// 2) Use Strings substring/lastIndexOf to find the correct index.
private static int findSubarrayPosition(int[] array, int[] subarray) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < array.length; i++) {
sb.append(array[i]);
}
String string = sb.toString();
sb = new StringBuilder();
for (int i = 0; i < subarray.length; i++) {
sb.append(subarray[i]);
}
String subString = sb.toString();
return string.lastIndexOf(subString);
}