diff --git a/src/ListNode.java b/src/ListNode.java index dd6028c..6aa71e8 100644 --- a/src/ListNode.java +++ b/src/ListNode.java @@ -1,3 +1,6 @@ public class ListNode { + public char data; + public ListNode next; + } \ No newline at end of file diff --git a/src/Practice.java b/src/Practice.java index 34a2f8d..69a5a7d 100644 --- a/src/Practice.java +++ b/src/Practice.java @@ -1,5 +1,83 @@ public class Practice { public static void main(String[] args) { + ListNode myNode = new ListNode(); + myNode.data = 'x'; + + ListNode anotherNode = new ListNode(); + anotherNode.data = 't'; + + myNode.next = anotherNode; + + ListNode moreNode = new ListNode(); + moreNode.data = 'r'; + + anotherNode.next = moreNode; + + ListNode coolNode = new ListNode(); + coolNode.data = 'w'; + + coolNode.next = myNode; + + ListNode extra = moreNode; + moreNode.data = 'e'; + + ListNode hello = new ListNode(); + hello.data = 'x'; + extra.next = hello; + + ListNode newHead = removeAt(coolNode, 0); + printList(newHead); + //int xCount = countX(coolNode); + //System.out.println(xCount); + //System.out.println(extra.data); + + //System.out.println(myNode.next.next.data); + //System.out.println(myNode.data); + //System.out.println(anotherNode.data); + + } + + public static void printList(ListNode head){ + //start from head + //print all data in list in order + //keep track of current starting at head + ListNode current = head; + while(current != null){ //until end of list + System.out.println(current.data); //print out data at current + current = current.next; //move current to the next node + } + } + + //count how many nodes hold an x + public static int countX(ListNode head){ + ListNode current = head; + int count = 0; + while(current != null){ + if(current.data == 'x'){ + count++; + } + current = current.next; + } + return count; + } + + //remove the node at removeIndex, and return the head of the list + //example: + // e -> t -> k -> y + // removeIndex 2 + // e -> t -> y + public static ListNode removeAt(ListNode head, int removeIndex){ + if(removeIndex==0){ + return head.next; + } + + ListNode current = head; + for(int i=0; i