add addTwoNumbers
add listnode
add mergeKLists
add removeNthFromEnd
add swapPairs
add package info
add reverseKGroup
add RemoveDuplicatesFromSortedList
add RemoveDuplicatesFromSortedListII
add partition
add reverseBetween
add treelinknode
add PopulatingNextRightPointersInEachNodeI_II
add LinkedListCycle
add LinkedListCycleII
add CopyListWithRandomPointer
add sortList
modify variable name in sortlist
add reorderList
add insertionSortList