public void RemoveSingleNodeList()
{
// Arrange
RemoveNthNodeFromLinkedList.ListNode head = new RemoveNthNodeFromLinkedList.ListNode(1);
RemoveNthNodeFromLinkedList algo = new RemoveNthNodeFromLinkedList();
// Act
head = algo.RemoveNthFromEnd(head, 1);
// Acct;
Assert.AreEqual(head, null);
}
public void RemoveNthFromEndTest_12345()
{
// Given linked list: 1->2->3->4->5, and n = 2.
// After removing the second node from the end,
// the linked list becomes 1->2->3->5.
// Arrange
RemoveNthNodeFromLinkedList algo = new RemoveNthNodeFromLinkedList();
int i;
RemoveNthNodeFromLinkedList.ListNode head = new RemoveNthNodeFromLinkedList.ListNode(1);
RemoveNthNodeFromLinkedList.ListNode current = head;
for (i = 2; i <= 5; i++)
{
RemoveNthNodeFromLinkedList.ListNode node = new RemoveNthNodeFromLinkedList.ListNode(i);
current.next = node;
current = current.next;
}
RemoveNthNodeFromLinkedList.ListNode[] expected = new RemoveNthNodeFromLinkedList.ListNode[4];
expected[0] = new RemoveNthNodeFromLinkedList.ListNode(1);
expected[1] = new RemoveNthNodeFromLinkedList.ListNode(2);
expected[2] = new RemoveNthNodeFromLinkedList.ListNode(3);
expected[3] = new RemoveNthNodeFromLinkedList.ListNode(5);
// Act
head = algo.RemoveNthFromEnd(head, 2);
// Assert
i = 0;
while (head != null)
{
Assert.AreEqual(head.val, expected[i].val);
head = head.next;
i++;
}
}