Integer is used as data in 2 pre-created double linked list structure. The first elements of these lists are the Head and First blocks. Common numbers exist in these 2 linked lists. Common numbers can be more than one in both lists. In order for the number to be common, it must be in both other lists. If there is more than one in the same list and not in the other list, it will not be considered as a partner. Find the number of numbers that are common 2 times in these lists.

Integer is used as data in 2 pre-created double linked list structure. The first elements of these lists are the Head and First blocks. Common numbers exist in these 2 linked lists. Common numbers can be more than one in both lists. In order for the number to be common, it must be in both other lists. If there is more than one in the same list and not in the other list, it will not be considered as a partner. Find the number of numbers that are common 2 times in these lists