首先,在解释问题之前,您应该看到这个简单的类来理解我的问题:
class IntNode
{
public int value { get; set; }
public IntNode next { get; set; }
public IntNode(int value)
{
this.value = value;
this.next = null;
}
public IntNode(int value, IntNode next)
{
this.value = value;
this.next = next;
}
public bool HasNext ()
{
return (this.next != null);
}
public override string ToString()
{
return this + " --> " + this.next;
}
}
好的,所以我希望你能理解课程。 现在,这是我的计划:
static IntNode RemoveDuplicate (IntNode head)
{
int num = head.value;//the number for repeating check
IntNode pos = head.next;//current position - start from the second
IntNode prev = head;//node before the current position
IntNode bprev = head;//ndoe before the preverious of the current postition
IntNode bbprev = head;// node before the preverious of the preverious of the current position
int counter = 1;//for repeating count
while (pos != null)//as long as there is what to check
{
if (pos.value == num) counter++;//if the current value is the number count + 1
else//if there is another number
{
counter = 1;//set counter for 1 (the number already counts)
num = pos.value;//set the new num
}
if (counter == 3)//if count has reached 3
{
if (bbprev != head)//if the bbprev is not the head
bbprev.next = pos.next;//set its next to the current position next node
else//if the bbprev is the head
head = pos.next;//delete the third first nodes
}
else if (counter > 3) prev.next = pos.next;//if count is over 3, delete pos node
bbprev = bprev;
bprev = prev;
prev = pos;
pos = pos.next;
}
return head;
}
static void Main(string[] args)
{
IntNode p5 = new IntNode (13);
IntNode p4 = new IntNode (13, p5);
IntNode p3 = new IntNode (13, p4);
IntNode p2 = new IntNode (2, p3);
IntNode p1 = new IntNode (2, p2);
IntNode head = RemoveDuplicate(p1);
Console.WriteLine(head);
}
如果有2个或更多,程序的作用是删除重复项。例如,如果给定列表是:
1,3,3,3,4,5,5,6,9,9,9,9。
输出列表应为:
1,4,5,5,6。
当我执行我的代码时,我收到一个错误:
进程已终止StackOverFlowException
(也许不是确切的单词,但如果你知道C#你应该知道这个错误...)但是我无法找到为什么程序通过无限循环运行。我甚至按照它在Main中创建的列表,但我不知道为什么......
答案 0 :(得分:3)
问题在于:
public override string ToString()
{
return this + " --> " + this.next;
}
this + " --> "
将自动尝试获取this
的字符串表示形式,它将调用this.toString()
这是我们当前所处的确切函数。这种情况不会发生(ToString()调用ToString()在同一个对象上调用ToString(),直到触发StackOverflowException。
您想要打印节点的值。另外,请确保仅在Next
时才访问null
。
public override string ToString()
{
if(this.HasNext())
{
return this.value + " --> " + this.next;
}
else
{
return this.value.ToString();
}
}