LinkedList a = new LinkedList(new int[]{12, 6, 29});
LinkedList b = new LinkedList(new int[]{23, 5, 8});
LinkedList c = new LinkedList(new int[]{90, 20, 59});
b.mergeSort(true);
c.mergeSort(false);
findSumTriple(a.head, b.head, c.head, 101);
}
static void findSumTriple(ListNode l1, ListNode l2, ListNode l3, int target) {